I will speak as a complete layman 
For me it's very obvious there there are at least 2 persons involved. Compare for example You are not allowed to view links. Register or Login to view. and f31r.
5 scribes are less obvious because there are "middle ground" pages, something in-between the given extremities where you may wonder if it's one the "extreme" guys in less extreme mood or yet another third guy.
I also understand that paleography will never deliver the definite answer that wil make all the critics silent. You may point the some writings look different but you won't say for 100% that they were written by different persons.
On the other hand I wonder is this question about the number of scribes really helpful in solving the manuscript. What would it give us if we know for sure that it was made by 1,2 or 5 people?
For me it's very obvious there there are at least 2 persons involved. Compare for example You are not allowed to view links. Register or Login to view. and f31r.
5 scribes are less obvious because there are "middle ground" pages, something in-between the given extremities where you may wonder if it's one the "extreme" guys in less extreme mood or yet another third guy.
I also understand that paleography will never deliver the definite answer that wil make all the critics silent. You may point the some writings look different but you won't say for 100% that they were written by different persons.
On the other hand I wonder is this question about the number of scribes really helpful in solving the manuscript. What would it give us if we know for sure that it was made by 1,2 or 5 people?