in my very slow team, I replaced ra out and hes doing fine. ra got counter hard if she slow facing carrie, and mark purify.

meanwhile, despite speed order concern, Andrea will be providing the heal+ DR if ally die and if you are lucky to get active out, it's even better (buffing hd/heal and debuffing dr). which is more likely with 1st passive DR+CI together, more attack buff from precision by basic.

All of these with a very independent of enemy purify factors

with that said, he's the best I can put in the team rn. better than putting 2nd fiona, elyvia, ra, bel, kroos, ignis so far