I think in general, the real reason with Fives, is similar to running RG, it just take TIME to beat him. That time can widdle away on the arena timer. It's not nearly as bad as it was right after the update, but I had to have my Yoda go 1v1 against Rg and had to hit auto to make up time before I ran out. BTW Yoda works very well now, as he should. Nerfs were not a factor. I watched him pick away at Rg while Yoda himself was at 30%. Beautiful victory.