Seriously, you have to change the call if the player was dribbling the whole time. Heck, it's one of the fundamentals of the rules that a player can't travel while dribbling, so trying to stick with such a call would be ridiculous.
Your first clue that you might have missed the call was the protest from the player. However, what happened next is bit puzzling to me.
1. Did YOU go seek extra information from your partners or did one of your partners come to YOU and offer it? There actually is a significant difference between you asking and one of them volunteering. I'm far more likely to volunteer information when the play is strictly a rules situation and to stay out of it when it's a judgment call, including an OOB call. Most of the time, if the calling official doesn't come to me and ask, he is on his own.
2. Was it the Center who provided the help or was it the new Lead?
I'm not sure how I feel about the Center helping under these circumstances. Obviously, if he hadn't you would have completely blown the call, but on the other hand I'm not thrilled that one of your partners was looking at a trap three feet from you instead of doing his job and observing the other players in the backcourt trying to get open to receive a pass. A defender could have been holding one of them and that is why the trapped player was having trouble. I'd be disappointed to learn that one of my partners didn't believe that I could officiate a 2 v 1 trap right in front of me, whether that's true or not.
I know how I feel about the new Lead attempting to help with this play. What the heck is he doing looking back there? Doesn't he have players in the frontcourt or near the division line who need observation? I would call that ball-watching and not be happy about it at all.