I don't accept this notion that Everton can't get Poch. Let's remember he was manager of Southampton before joining Spurs. Koeman was a Southampton manager, with a great pedigree as a player, became a manager @ Everton.
Poch is not yet ready to manage a big club as he hasn't won anything yet to put on his CV. The expectations of big clubs are to win trophies. Simple as that. Poch has no track record.
Everton is the right project for him. He can develop Everton's youth. Retain the high pressing game. Plus have the luxury of having money to spend on players and build a winning team.