I am sorry, there is a place for zone CBs in our system. Outside VD, pretty much all our CBs get some safety help. If you have talent to work with, you take it if you feel you can use that talent and coach them up.
The whole "holding the ball too long" rhetoric is ridiculous. You could argue that happens what, 2-3 times a game? Out of ~40 passes. It's even more ridiculous when you consider that's exactly what those plays call for and the alternative is trying to make a risky play that could turn into a fumble or interception.
I'm perfectly fine with the decisions Luck has made so far this year. Zero complaints.