I’d certainly be much more worried about facing your team with either Zeline or Azlar as tank - I think Azlar might be better, with Zeline and Richard as flanks, Rigard and Chao as wings. Worth remembering that @Kerridoc disagrees and @Kerridoc is smart.
That ranking is pretty reasonable, I think. I disagree with it a little - I’d rank them
Aeron > Delilah > Zeline > A Used Baby Wipe > GM
but perhaps that is because my own attack team is not particularly vulnerable to GM.
With respect to your team in particular, I feel obliged to note that facing Delilah in tank with Zeline and GM as flanks is pretty horrible. Giving GM Delilah’s protection makes him a much tougher proposition than when he is in tank, and he is likely to survive much longer (and get his special off repeatedly). Zeline’s annoying special can also foil many well laid plans, so an attacker has to worry about her at the same time. Plus the simple task of killing Delilah is not always easy - her special is particularly troublesome and combines very well with the others.
So I strongly recommend you continue with GM as your tank, just to make my life easier when I attack you.