Sorry but I'm not too informed on Victor Butler's skill set.
What type of LB is he; what does he specialize in; does he cover TE/RB well; is he more of a blitzer; can he recite the alphabet backwards while standing on one foot and holding his index finger to his nose?
He can play either OLB position but was mainly Spencer's backup, so he's a SOLB. His play time was sparse because he played behind two of the better OLB's in the NFL but he produced whenever given the chance. He's also familiar with Rob Ryan's scheme.