Is Rudy as/more critical than Roy?

I noticed that when Rudy doesnt play, we play bad.  I dont know the exact stats but i beleive Rudy has missed 2 games and we have REALLY missed him those 2 games.

Every time Roy cant play, it seems like our team really rallys together, but when someone as important in his role as Rudy is goes out, somethings missing and doesnt get filled.  James Jones last year?

What do you guys think?

Obviously i'd rather have Roy in there, but it just seems that Rudy is one of those players that we need.