And there's also a reason he had another job in, what, a couple of days?
Quinn's additional attention is admirable, but I won't hate on a guy who says "get me the best fit for this team and I'll work with it". His job is to coach, not tell the scouts who to pick. In fact, at the age of 34 years old, telling the scouting team who to draft probably wouldn't have gone over well. You have guys who were scouting when Moore was in middle school, and some likely when he was in grade school. DQ has been a collegiate or professional coach almost as long as Kellen has been alive.
I don't think it's about approach, I think it's about knowing the situation and circumstances. Being a super-young coach in the NFL can't be easy because you're younger than some of the guys you are coaching and likely have far less game experience than anyone on the roster who isn't a rookie. There's almost 20 years difference between the 2, and nearly all 20 years are collegiate or professional experience. Nearly 30 years of coaching experience at both levels buys you a little freedom to say, "I want this guy".
I think Kellen did fine at times, but at other times he was trying a bit too much. I wish him well and think he will improve as he gains experience. Unfortunately, Dallas doesn't have the time for another 10 years of OTJ training like they wasted on Jason Garrett.