I was just quoting the folks that have said they need to "see" the gun going into the holster. I play gun games and always deliberately holster, upon command to do so, don't remember the last time I looked.
I play the same games. Doesn't happen often, but I have seen people holster, walk ten feet adjust their shirt and the gun falls out. Shirt was caught in the holster. And this is in a regular old OWB hip holster, without concealment. Not IWB, and not concealed.