Well in that case, Minato and Hashirama are really all that's needed.
with BM Minato can take Obito since he has the same power that allowed Naruto to beat Obito's paths and he's already beaten Obito in base before.
Hashirama with shinsuusenjuu simply merks the remaining akatsuki with his mountain-range busting shinsuusenjuu barrage. Akatsuki isn't surviving that since they don't have a defense as durable as PS nor are they defeating it as they don't have offense on the same level as kyuusanoo. They can all combined their most powerful offense and it won't do squat to SM Hashirama.
However there is a decent chance akatsuki can win this due to the no-intel stipulation as no intel against Itachi means Hashirama could very well get caught in tsukuyomi. If that happens he could fall right there, and without hashi, akatsuki would win.