What would be the best MB for Youngsub + Sara?

I want to grind mastery to elite for 3 chatacters at the same time?

The setter for my comp will be Sara since she’s running in this event.
The WS will probably be Youngsub tough it may also be Jaehyun tough that’s very unliekely.

So who is the best MB that can complete this comp and why? (Both from event and from normal spins)

Also prefferably excluding Yamadera and Hanra since I already have masteries on them.