Better than McNeil so if we could sell McNeil and have Wilson as backup that would be fine. No idea why he'd join us as backup though when surely plenty of clubs, maybe not necessarily in the Premier League though, would guarantee him a start each week.
Why would he join as a backup?
Premier League football is a squad game. As we have seen this season injuries and suspensions happen regularly, players have lulls in form; options and choice is mandatory. You have to have two players at each position to even tread water.
No club as a fixed, set in stone first XI. Any player will look at Everton, look at the players occupying the positions he plays in and will make a judgement call. The players who go "yeah, I'm better than that, I'll get that spot" are the ones you want.
Take Harry Wilson for example. He has three spots he could get into. If Fulham can't afford his new deal and he fancies Everton. You'd certainly want him.