Sannin VS A, Mei & Onoki

[Drakengard]

Onoki's the real problem here. Being able to increase A's speed, efficiently use earth style, and of course his Dust Release makes him the key player of the second team. However Jiraiya has back-up to give him the time he needs to enter Sage Mode, and Tsunade can possibly further increase Jiraiya's attacks by acting as a battery like she did for Onoki's huge Jinton. Not to mention Frog Song, which could easily be the trump card if used right.

 

[Icelerate]

Yeah Sannin high difficulty. Not only can they work as a group but they have large multiple summons to fight alongside them. Jiraiya can enter sage mode if Tsunade and Oro cover for him as well as all the summons. Once he enters sage mode, one of the sannin will be dead so it would become 2 VS 2 as I think Mei isn't lasting too long.

Then Jiraiya can use the frog song putting the A and Oonoki in a genjutsu and then finishing them off.

 

[Cerox0]

Sannin, they are all beyond Kage and IMO together there is virtually nothing they can't do together.

 

[USSJ Future Trunks]

except beat team 2.