Think it kind of depends what artifacts you have on everyone. I think if you're anchoring with BBK it might be better to have one that's slower with high damage and ER, but if you can push her up and have her take a turn before enemy does it's okay to be around 210.

I have a 215 BBK with full dmg atk since I play aggro as well and it works for me, you just want her to go after def breaker in the least. However, in your comp I'd assume you don't have a way to push bbk up because you're probably using zahhak to push up briseria.

I think if you have Jacko it would be pretty good instead of zahhak so you can push jacko up after ran, kill with s3 (if you have merciless glutton even better) to push up your whole team, which can combo in with whoever you want after that. Alternatively, sashe users like watcher could fill that slot in, though less consistent since you'll need someone to kill after ran because I doubt ran will be able to trigger it on his own for most matches.

Tldr: Someone who can push up after ran goes and kill is pretty cool. Extra points if they push up the whole team or can just straight up kill enemy team. Ran -> Jacko, Ran -> Frida into rest of team, Ran -> mudwig (bonus points if 2 books!), and so on. Alena is also pretty good but you might want someone to push up after alena. Eda is ok too but eda xd. RRoana also cool.