You seek YODA..... Sorry had to say it...
Savage might be an option if you need a cleanser...
Rex is Glass... You need a tank to protect him till he can move.... Rex(L) teams work because Rex gains TM on crits, so he is able to move early. DN(L) + Rex would be easy to defeat, just stun Rex early.
GK would be an option for a cleanser on a DN team. As would Chaze...
Rex is strong if in the leader position... but IMO is to slow otherwise. For a non-leader spot, Yoda can offer more...
-With good speed focused Mods Yoda can move first, and give your squad Tendacity Up (and foresight with zeta). Tendacity UP + Foresight means It will harder for the AI to remove Tendacity UP from all your toons.
-If you use EP and do his "let the hate flow attack" you drop all enemies below 100% health, making Yodas #2 special a reliable stun attack.