Chuck can barely defeat, by himself alone, Sylvester and Steven together.
Sylvester and Chuck are a perfect match for Arnold and Steven.
But if Chuck and Arnold exchange places, Sylvester and Arnold together can decisively beat Chuck and Steven.
Who is stronger, who is weaker?
Ok we have Chuck; Sylvester; Steven and Arnold
I have a theory that the earlier your name is in the alphabetic order the less stressed ( and hence healthier and stronger) you will be. Comes from less waiting time when lists of names are used.
So taking their probable usually used names - Chuck (already a nick name); Sly; Steve and Arnie.
Ordering we have 1. Arnie. 2. Chuck. 3. Sly. 4. Steve.
Easy.