That's the point though isn't it. It's not like he covers 3/4 positions like say Bernardo Silva covers 3/4 positions - ie really well. He's got some ability, but lacks the physical qualities - speed, Balance and dexterity - to make that ability really count a lot of the time. He works hardish, but again it's all a bit one paced so is also compromised.
As for this 9/F9 thing, let's see how it works in real games against half decent sides. He was OK against a couple of shit teams, but like the other positions he's tried, I'm pretty sure against half decent teams he won't look so OK much of the time. Although to be fair, our looking good No.9 bar isn't exactly high lately.
Buying and then hanging onto players like this because he occasionally produces "a moment" is what's fucked us badly the last few years. Rule number 1, don't buy meh. Rule number 2, once you know they are a bit meh, fuck them off asap before that meh gets more and more exposure.