There are awkward stages where you need more than your weakest character to burn through to kill Mando before he starts one-shotting people, but your next strongest is too strong.
My RG is g8 & had trouble finishing t1 without help (I added my g6 CUP who stuns on basic). Around t4 I was struggling trying to get the right combo. Eventually daka was low enough damage but enough stuns to do the trick. But it's not easy. You want to have the power to burn through IG-11 & get to Mando quickly enough but not so quickly you can't get all your stun attempts. Obviously dooku, daka & aayla are your best friends in the event, but RG can help during whatever tiers he's appropriately geared to do.