Darth Revan & Malak- Why should He be able to Hold on Defense?

Then what's the "payoff" for investing all the time, crystals, and/or cash into earning Darth Revan and Malak?

Ostensibly it's to get higher raid scores, more resources, and stay at the top of the arena. I enjoy arena, and I enjoy the Darth Revan mirror matches way more than Jedi Revan mirror matches. That being said, I also enjoy only having to do 3-4 battles to get to #1, instead of 9-10. It takes considerably less of my day to do so.