[It's highly possible (AND ACTUAL CANON BUT) that Sasuke wanted, or needed, to hear from Sandaime, to go straight to the source to learn about his clan and the real reasons behind what had happened to them.

Still didn't explain why the others were revived though, and to go to such extremes...]

There's a lot we should probably explain, Kushina. But I think I'd like to hear more about what's happening in the war first.

[He'd apparently been there, after all, and breaking the news about their friends to his wife... maybe he should have done that sooner.]