I agree, from what I've seen/heard about him he seems decent but as you said, more of a squad player & not really a significant upgrade, if one at all, over Fred. From what I recall from the WC, he looked like a big, see Rashfordas a , hard working central midfielder, solid short range passing & relatively composed on the ball under pressure. Small sample size for me so it's hard to really judge, but beggars can't be choosers & we do need some alternative options in the middle as the Mount - Fernandes - Casimiro midfield I think will only work in certain circumstances IMO.
I think Wolves inadvertently countered a lot of things EtH had wanted to do, plus they played well & made calculated decisions on what areas of the pitch they would press us, which didn't really create the holes in the middle for Casimiro, Fernandes & Mount that I think he thought were going to exist.
I read the other day that if he takes a pay cut & goes to West Ham, he'll effectively lose around £12m in wages, bonuses etc over the 2-3 years he has left on his contract to run at Manchester United so that's probably what the 'pay off' he's looking is for. Although the article I read said that West Ham were going to pay half & United pay the other half as his signing bonus. I honestly don't blame him for wanting the difference/gap at least closed, after being stripped of the captaincy, benched & ridiculed during his stay, he's probably in no rush to do the club any favours.
Sancho for me should almost always start as not only is he tricky, quick & agile enough to wriggle past people, but he's got a brain, gets his head up & actually looks to play in other players regularly. I think he'd be a better balance in almost all cases but that's just me, Garnacho I'd continue to primarily have off the bench for now as an impact player as I don't think he's ready to be starting every week yet. I'm also not against Mount playing in wide areas which I've seen him do a few times at Chelsea, he's got that sort of head up, who can I play in mentality that I think Rashford, Hojlund or Martial will need if they're to be effective.
Against Spurs I'd go with Sancho - Rashford - Anthony.