So you can skip the future of the main antagonist from part 1? Yes, part 1 is over.
Just like that? And after his supposed "redemption"? Yes, because Orochimaru is obviously not very important to Kishi, the guy writing the story.
And what about Kabuto? Now that I'm interested in, but again apparently not Kishimoto.
I want to know if they payed for their sins or not. Me too.
Would I have like to see more about these two? Yes, but we didn't so deal with it. Just because us fans think certain characters or plot points are interesting doesn't mean the author does and it doesn't mean they will get panel time.