Matas said:
Tobirama is so awfully written and those damn flashbacks were just a plot device to bring the hokages into the fray, what they revealed should have had no influence on Sasuke's decision, he should have come to that conclusion beforehand. They barely did anything anyway but reveal that Kishimoto has no idea how to create a backstory that isn't the same as Naruto or Sasuke's. Also damn, Karin is stupid as hell.
This and the previous chapters really frustrated me, but I guess I shouldn't be expecting anything from this.
I don't think what they said did much to influence Sasuke. Honestly, I truly do believe he had already decided after Itachi's... second death?