Utility of fives vs boba fett? (Esp for defenses)

5s! All the way. You wouldnt really want 5s on a counter attack team anyway. I know.. he has counter attack, but heres the thing. 5s basic attacks a 2 turn slow. When he counter attacks, he uses his basic attack to spread this slow. Once 5s has the entire enemy team slowed, you just crush, kill, and destroy with whatever else your team is made of.