- Yes, lots of horror, pain and losses.. that's not the way for bringing worldwide peace and Sage knew this. Elder brother being a little " jealous " as you said, is only the beginning. Being envious @ the ones who are close to you, is the start for being entirely evil in the end.
We simple don't know SHIT about the Elder Brother.. so choosing him as the best villain, is stupid. IMO, it's starts from Zabuza to Madara.. and it's damn obvious, that Madara is the best villain. That guy planned everything out and is evil as fuck.
Orochimaru was freakin badass, but Madara Uchiha, is simple the ruler in this section.