Who should be my 5th toon in arena squad?

nite0wl29

I want to run a Rex (l), TFP, Sun Fac, Boba, Fives team to counter the Zaul teams in arena. My only problem is that my Fives is only gear 8. Who should be his replacement? Here's my roster and you can also see the current arena team that I'm running. https://swgoh.gg/u/nite0wl29/. I'm also open for ideas as who who I could replace in my current arena team since there are still EP leads in my shard

Drax_77

I would give ep a shot in 5's place, the stuns and shock should help against a maul squad.

mlb1399

Yeah, I would keep one of your most powerful characters in EP in the lineup. If you can develop another cleanser, that would help make your Rex lead more successful.