Joining a big team is a fairytale story but if the onus is against you, it can be nightmare. For both Darby and Moyes, it wasn't meant to be.
Moyes was hailed as the 'Chosen One' after he was personally handpicked by former Manchester United manager Sir Alex Ferguson to manage the side.
But the 'Chosen One' proved to be the 'Failed One' after United sacked him, just 10 months after he succeeded Ferguson.
"Manchester United announces that David Moyes has left the club.
"The club would like to place on record its thanks for the hard work, honesty and integrity he brought to the role," said United in a press statement on Tuesday.
Heartening words but the damage was done. The team's poor performances led to the sacking.
The current titleholders are currently seventh with eleven defeats and they have been eliminated from both domestic cup competitions, Carling Cup and FA Cup and the Champions League.
They're out of Champions League contention and they might even struggle to qualify for the Europa League as they lay six points below Tottenham Hotspur with four matches to play.
What really happened? Was it really Moyes's fault?
Steve Darby, who was recently sacked by Super League side Kelantan said that Moyes had many unseen problems.
"I sense resentment from the senior players. He made it known that he wanted Leighon Baines, do you think Patrice Evra was happy?
"And I think the power of social media is obscene. There are some people out there who seem to know everything," said Darby.
He also gave examples during his time in Kelantan when some fans vented their fury through social media.
"At Kelantan, I was being abused by one 'expert'. One of the media staff found out that he was only 14!
"It was also humorous when someone who is 200kg telling me that Ahmad Fakhri Saarani is not fit.
"I had one 'expert' tell me who I should have picked for Kelantan. The 'expert' said I was a 'bodoh' (stupid) but in that 'expert''s team for one of our matches, the person had four foreigners and a suspended player in it!
"In his next post, he hammered (Jose) Mourinho. So, I was in good company," joked Darby.
Kelantan's Adviser Tan Sri Annuar Musa made the decision to sack Darby after the Red Warriors were thrashed by Sime Darby 4-0 last week.
He took the decision after discussing with the team management and before the decision, he tweeted his thoughts about the team selection which led to the sacking.
"The decision was handled professionally by CEO Kevin Ramalingam. It's a business decision and employment is their right. I have no personal animosity with Tan Sri or Kevin.
"Local players were top class professionals as was former Egyptian international Mohamad Shawky. Technical staff were excellent. They were supportive, talented and loyal," said Darby.
Coming back to Moyes, Darby said that the Scottish manager had to face complex issues like player power and media, both formal and informal, were making unrealistic demands which creates unnecessary pressure.
"To me, he should have at least one season. Look at (Brendan) Rodgers at Liverpool, he held on by his fingertips and now he is close to bringing Liverpool the title.
"Its always been trophies and profits. Just that now the profits are bigger but the game is changing. I believe social media is having a massive negative impact.
"I have no problem with trained journalist having a opinion based on research and facts, but with bloggers and Facebook pages.
"People who have never played, coached or even go to games are causing online trouble and this is influencing decision makers," said Darby.
I don't know if i'm trained enough to give comments but here are my two cents on both these gaffers.
I personally feel that Moyes should have been given more time to rebuild his squad.
Ferguson said in his autobiography, "Rebuilding held no terrors for me. It was second nature. A football club is like family. Sometimes people leave.
"In football, sometimes they have to, sometimes you want them to, sometimes there is no choice for either side, when age or injury intervene,"
I'm sure Moyes had his plans to rebuild this ageing squad but he couldn't fulfil his quest. If he was given another season, I think he could have made a difference with his own squad.
But at the same time, he didn't convince his doubters with his press conferences. He looked shaky and just couldn't find a tonic to bring out the best from his off-form side.
However, I truly believe that time heals things and Moyes could have been the remedy for that.
Ryan Giggs is now the interim manager for United and he has brought in Paul Scholes and Nicky Butt to his backroom staff to help steady the ship.
As for Darby, I'm sure he knows the nature of Malaysian football. It's instant success or you're out. As a person, he is humble and very friendly to the media.
But in football, none of these guarantee a lifelong stay. Kelantan had a yo-yo season and the fans couldn't adapt to his tactics.
Just like Moyes, I felt he should have been given more time and realise his plans with the team. Kelantan are known to be slow starters and they will somehow peak as the season goes on.
Pity, Darby is no more there. Former T-Team and Aston Villa midfielder George Boateng has been appointed as the head coach and Annuar expects Boateng to implement some freshness into the team.
Darby is currently in television and radio as a pundit while Moyes is resting while pondering his next move.
Both of them are true gentlemen in football and I wish them the best of luck in their future undertakings.