The Flash
Dennis Wilcock did 9/11
I think Rudess just doesn't want to be overshadowed technically. Petrucci does amazing things technically so Rudess wants to match him. Because he's just as capable technically. Would much rather prefer if he was coming up with stuff that creates a great atmosphere or basic (not that basic of course) cool melodies. I love what he does on Blind Faith, for example, something of that effect.