🍁Nine Ancient Obelisks

6 would work too, it's closer.

I'm sure that 6 on the right is better. It's not a given that Ginza has exactly 3 skill points; if it's more, he might bind me when attacking the archer-5 on the left.
OR 1 on the left. But from the point of view of making Sheila's life easier, while maintaining the expected number of kills, it's better to have him on the right.

Hmm... I'd put 5 on the right and use taunt. Either he risks it, or Sheila does. He probably won't be able to draw all the aggro to himself, maybe he can distribute it somehow.
And let 14 stay in place, guarding his boss, why distract him?

Hmm...

Well, actually, that's a good option. In theory, it could save Sheila if she's lucky, and there's a chance that Kami won't take a million damage.

@Alex, what do you think? I'll put 6 on the right, the tomato 6 to the right + taunt, and Jack up top. Overall, the main problem we have right now is on the right.