I like Glen and how he's evolved in the series BUT I still don't see him as the leader. I think as long as Rick is (in Glen's words) "roaming around crazy town" I would go for Daryl (assuming he's returned to the group) as leader.
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK
I would go for Daryl (assuming he's returned to the group) as leader. 
