Can confirm this works. It is not 100% sure it will hit but in higher ranks it is a reliable way to do so. My crystal run was based on this.

Based on this, Vaan seems to be the best choice for 2 reasons: 1: He has two hp attacks, so he can aim at two bots at once. Cast white whorl or calamity, change target, charge pyroclasm , change target , release pyroclasm. Most likely one of the two will hit someone. 2: By landing so many HP attacks, they will get stronger without needing any BRV attack. This is important, because I need 4 Salvation Scythes to kill each bot, assuming I only Spam it. That is why in my matches I kinda try to hit someone with BRV now and then, just so one of the hits causes 1500+ dmg, effectively lowering the number of scythes I have to use. However, the BRV boost vaan gets on his HP attacks will lower this number to 3 or 2 most of the time withuot worrying about that, which is a big time gain.

Another reason I'm considering the "Spam tactic" is our allies behaviour. If the enemy has less HP, they will more easily gather brave for killing, which I hope encourages them to do so.