I think our squad or at least numerous important players are more suited to a 352 personally although the squad isnt well built for either.
You look out wide, Morishita isnt as effective wide. Jorgensen doesnt look quick enough wide although early days. And we dont have any alternatives there. Our width comes from Alebiosu who is freed up as a wing back.
The centre backs arent good enough to not need a third player back there. Miller is fine right side of a back 3, within a pairing there are far bigger doubts. It also makes the Cashin signing stranger if we just plan to go to a back 4 with him at left back, out of position.
And up front, the plan is seemingly to have 4 forwards for 2 positions. As mentioned, Gudjohnsen (and even the below average Ohashi) seem to be more effective in a front 2.