A previous thread mentioned using Fangtooth, who I am on the fence with (I have memories of my opponents farming Kraken, this could be the same deal...) but I personally dropped A&G from my roster before the errata and tried gutter a few times, but always found the inf that I gave her would be better used elsewhere. Her 2 momentous dmg is reliable, but I usually had too many buddies around to warrant a good scything blow. I have found that in some cases, with oSiren and Corsair, I can set up a kill with Corsair wrapping and getting a TO all by himself. It's not always the case, there are some teams that this can be incredibly difficult to do this to, so I will try to pivot to goals. My usual six are: Corsair, Tentacles, Sakana, Greyscales, Hag, and oSiren. Shark and vet Siren switch in depending on the match up.
But to me Gutter seems to be the go-to for momentous damage. Fish can easily get crowd out support, and I just need to set her up much more carefully in order to get scything blow off. I might experiment with her a bit more. She has good movement and a decent kick, and I have had her go and score goals before as well, so that fits in nicely.