I run him, you don't have to wait to zeta BM before using him, as the tenacity up is key against sith teams. Gear up the little green goblin and give him all the speed you can.
The key to Yoda is speed. He needs to be fast, close to 250 before zQGJ boost if you want to get into top 10. Gk is not a must, but certainly helps, probably more on defense than anything.
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His tenacity up and foresight that he spreads helps a lot against zMaul teams.
However, General Kenobi is probably a must if you want to run Jedi and place in the top 10 of competitive Arena shards.