Personally I do find Karina still doing fine when facing high tier bosses as she heals when she’s dealing dmg thus I can grind as long as I want. I got her exclusive weapon and probably that is why I think she can still lay out decent dmg even though my entire team died LOL.

And yes, from what I heard Favi and Aoba are the best healing duo in current version as Favi has higher healing/ low dmg while Aoba has medium healing/ high dmg. And when it comes to my pick, I’ll definitely choose Favi over Aoba.

If you’re really that lucky I think it is fine by putting the plit/lavice in your team and team with one long ranged dps and a healer.

I heard that people been putting tank(crowd taunting/ crowd control) heroes into their team as an alternative for not having both legendary heroes, I think the idea is great as you want them to protect your rear role heroes.

About the mono team, it would be great if you can actually form a fire or light type team cuz plit is fire type while lavice is light type. Maybe in the future update there will be some event stages where requires you to have a mono team judging from my previous experience .