So by your rationale, Moyes is a fantastic manager due to his over achievement at Everton right?
I'm fairly certain Poch was not brought in 'to get close to trophies', he was brought in to build spurs into a title winning team.
Levy has been planning this for years, the stadium, the infrastructure, they thought they would be challenging for the title, they haven't and they aren't.
This is the fallacy and myth that has built up around Poch and Spurs, they have never challenged for the title!! When they finished second they were behind by a long way all season, when Leicester won the league Spurs crumbled and never got close. Ask yourself 'are united challenging for top four this season?' I bet you answer no, yet we are similar amount of points away to Spurs everyone they have 'challenged' for the title!