Lol. Not only was it never confirmed that Kin and Gin were apart of the squad Tobirama died to, but they were also an enemy of Kumo since they tried to assassinate the Second Raikage and Tobirama when they had a meeting [
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]. Furthermore, Kinkaku and Ginkaku were assigned to capture the Nine-Tails
before the meeting between Ay II and Tobirama took place, so unless you guys are saying that Kumo welcomed them and made them part of the elite Kumo Squad after their crime just like that, then this claim is baseless.
OT: No, I don't think even MS Kakashi can survive. Tobirama was killed by those ninja, and he himself can take on MS Kakashi, so it's highly unlikely Kakashi can succeed where Tobirama failed.