Yeah that's definitely different and I'm sure Chuck would have thrown a spare OWB holster at "that guy." Fortunately there was some self-selection going on in this class and the AIWB guys were using JM (me), KSG (the AI), and something else that was clearly safe and functional, and I don't recall any of the other folks having issues with their retention holsters.
I was the closest thing to impacting the pace being the guy with a single stack surrounded by Glocks and 2011s (I'm a really bad Millennial).