eh this is tough. it depends on whether minato and jiraiya knows pain's secrets or not. because pain is an absolute pain in the ass (pun intended) if you do not know the truth behind his 6 bodies. it'll be super imbalanced because it'd be practically 8 people vs 2. we also have to assume that these 8 will be simultaneously fighting the other 2, not one on one because its just tough luck like that in the ninja world i think.
so if they don't know, i think minato and jiraiya would lose, but not without giving a tough fight. kakuzu would just give away everything when showing off his 5 hearts so minato and jiraiya could finish him off with a mega giant rasengan combined together. minato and jiraiya have great teamwork i think so they could work very well together whereas the other 8 never fought together before.. the real trouble would be itachi and the 6 pains.. hard to survive with all the annoying summonings, pushing and pulling force from pain and amaterasu, susanoo from itachi going on altogether..
if minato and jiraya knew pain's secret, they would have more advantage and probably win. but probably faint from exhaustion after the fight? xd
lol, look at me analyzing the fight so thoroughly. this is just my opinon
