Bug or crazy Vader Zeta ability?

Or just keep Vader Stunned/Ability blocked and he never gets to use his pesky AoE. Or just have a tankier team that can survive through some DOTs. A guy on my shard was using a Vader Zeta lead in the arena with Vader, EP, RG, magmatrooper, and Savage. All g11, team was 50k+ but, it wasn't able to hold up against the higher DPS teams or Rex teams. 3 DoTs being constantly refreshed isn't really enough to get you in trouble, he needs more DoT characters with him for the full effect. Better for longer battles, but quick arena matches weren't really optimal for it. The TM removal from his leader ability was actually a bigger issue whenever I faced his team, but I always won and my team had 40k power the first time I faced him. Now at 43k. He just recently switched to a Zeta'd Cody lead with full clones. Rex and clone sarge were g11, echo and fives at g10 and cody was only g9. It was honestly a little more troublesome for my team simply because of Rex's cleanse + tenacity up, but still beat him both times I faced him. Seems as though he's been having some fun trying out the Zeta's and I do enjoy the clones as characters personally. But Zeta'd vader lead isn't really going to be standing up to burst damage in the Arena unless you have other characters that can apply DoTs before your enemy can get tenacity up.