Not so sure about that.
I don't have much faith in the club to do business for top shelf players but Slot isn't a big name that wants to bring in established big names. This club has traditionally been a springboard club: Modric, Bale, Sheringham, Berbatov, Eriksen, Walker, Trippier
Not saying we need to get back to that where we sell our best players but all of those would have been the right profile for a manager like Slot when they arrived.
In terms of not being a good fit, I think that's oversimplifying things because he plays 4-2-3-1 or 4-3-3. He also plays with inverted fullbacks from MF, a role that Porro looks like he could do well.
It's easy to look at a dysfunctional squad right now with zero clear rules defensively and say something like "Porro can't defend in a 4" but also forget that Amorim played him in a 4 without the ball and as an advanced wing back with the ball. That isn't a million miles away from what Slot does.
Spence has been playing in a 4 and 5 in France and did well. Emerson can play in a 4 as can Davies.
Udogie is a kid coming into the league for the first time. He doesn't need expectations on his shoulders and we have no idea what he might be here.
Probably Slot needs the same things most managers would need in this squad: Top class CBs and a more creative CM.