A and Bee win mid difficulty at most.
Tsunade's only use will be as support to boost Onoki's jinton and her slug may serve as some distractions.
Onoki's jinton enhanced by Tsunade's chakra could beat A and Bee as it did destroy 25 susanoo clones but Killer Bee can intercept the formation by bombarding them with a TBB barrage which don't require much time to prep unlike jinton. Also, Killer Bee could just toss Raikage towards Onoki and Tsunade or vice versa. These two have the speed to blitz Onoki and Tsunade especially together.
Tsunade's only use will be as support to boost Onoki's jinton and her slug may serve as some distractions.
Onoki's jinton enhanced by Tsunade's chakra could beat A and Bee as it did destroy 25 susanoo clones but Killer Bee can intercept the formation by bombarding them with a TBB barrage which don't require much time to prep unlike jinton. Also, Killer Bee could just toss Raikage towards Onoki and Tsunade or vice versa. These two have the speed to blitz Onoki and Tsunade especially together.