Since the update, Teebo has a bug. Even though he is invisible, his ability with his primary attack doesnt work in most cases. Also, since the update, my Ewok-Team that should be attacking often, ...
Teebo lead would be a great counter to counter teams though. I have had mine stealth entire squad before, so if facing fives and Dooku, they can be effective. Imagine stealthing Rey, who gets a buff for being in stealth, and hitting Dooku, who cannot retaliate.