Martinez was close to being sacked a number of times when he was at Wigan: http://espnfc.com/news/story/_/id/979912/dave-whelan:-i-would-sack-roberto-martinez?cc=5739
Previous managers got Wigan into the Premier League not Martinez. https://en.wikipedia.org/wiki/Wigan_Athletic_F.C.
Blackpool, Norwich. There have been other small clubs in the Premier League.
Wigan has an owner who probably has a lot to do with their success as well. Wigan are in the playoff spots now but they sacked their previous manager Owen Coyle, Martinez’s successor.
I’m just saying we shouldn’t read too much into things, one could say the team Martinez is winning with was largely created during Moyes’ reign as manager and that Manchester United was just a poisoned chalice job but I’m glad they went for Moyes in the first place, worth a try, Ferguson’s handpicked successor.
Actually Everton’s success has a lot to do with the players they got on loan (Lukuku, Barry, Deulofeu)
They will have a challenge in the off-season to replace them.
Sir Alex was close to getting sacked a few times as well, I think it was three years before he won any hardware at United.
One of the major part of Wigan’s attendance problem is due to that they are more of a Rugby city than they are a soccer city. Wigan was one of the least financed teams in the Premier League.
Just look at the difference that Martinez made after getting to a much better financed and supported club in Everton. I am not sure that David Moyes could have Everton right now in a position to possibly get in the Champions League. Moyes is not a good enough of a coach to put a Europa League or Champions League team together.