They win this easily.
If he starts with animal path summoning. They respond by summoning and Katsuyu wrecks each and every one of his summons. Simultaneously.
Pain being "I am a God" will try to blitz Tsunade and perhaps Sakura with a single path. (Like he tried with
You must be registered for see links
,
You must be registered for see links
, and
You must be registered for see links
).
Both medics have shown the reactionary feats to deliver a blow to the encroaching path. Since he has no knowledge nor has he cared about super strength in the past no reason to believe he'll break from habit. That's easily one path down. Now, he would then only know that one of them has super strength another path can be killed the same way from the other medic.
Now, Pain has no knowledge that Byakugou subverts death, nor does he know that Tsunade has incredible longevity. Another 1-2 paths can be taken out in surprise kills, like Tsunade planned for Madara.
Furthermore, the knowledge that they have super strength does not correlate to knowledge of terrain busting punches. ANother path or 2 can be killed from a ground punch depending on how many are in the immediate vicinity.
Then there is the vast amount of acid 10% Katsuyu can emit.
Or the possibility of a reverse healing platform.
All in all its too much for 6pop