Pep hasn't shown any true colors or acted like a turd towards Barca. It's just opened the eyes to some people that he actually is at another club now and is working for their best interests, not Barca's. Don't be butthurt or bitter about that fact and completely shun him off entirely, I don't like it any more than you that he left and is now not on our side but he's still part of Barca's blood and deserves admiration and respect for what he's done and who he is as a football legend.
I'd be all for bringing Lucho back to the club but he was a supporter of Laporta, so it's not as easy as you'd think to bring him back under Rosell. If the club called Enrique back, I'm sure he wouldn't actually think twice before saying yes because of how huge an opportunity it would be, regardless of Rosell. However Rosell himself might favor putting someone more loyal to him in that position (Roura, Rubi?) over Luis Enrique.