Agreed with your last paragraph, I just took your original post as you implying you haven't spent money in the transfer window, apologies if that wasn't your point.
I usually do critisize Poch, but I think his situation right now is similar to United's in a way.
Your players are worse than they were a couple of years ago, but the expectations haven't adjusted to match that.
Maybe he should have looked to sign different players, but it's too easy to say in hindsight.
As for the age difference between Sessengon and James, that doesn't really matter when James had never played in the premier league. Both young players expected to make a big impact in the years to come rather than immediately.