From the Post Today:
"...Because both he and O'Brien will be on the same footing as far as contract status goes, Narron probably will be more assertive than Miley was when it comes to getting his say in club matters.
The first demonstration of that came Thursday, when Narron was asked about his spring training plans. Aside from the usual talk about fundamentals, he said the practice of splitting the spring training roster into two squads and having morning and afternoon workouts - an O'Brien-initiated program the last two springs that was not very popular in the clubhouse - would come to an end."
I think that alone will make Narron more successful than Miley.