Are retention holsters bad for training the draw stroke.

So I'm looking for my first carry holster. It's already big coat cold here, and I'm not exactly ready to stuff a gun down my pants, so it's OWB for me (it will ask be good for range practice). I've decided on the Safariland 7378 for a number of reasons - but mainly because it can be molded for use with a light, but still train the gun without it attached (I won't get a light for a little bit, but I'd rather not get two holsters.All that said, it does have a thumb activated retention switch (the "ALS" type). Its pretty intuitive/not needing am odd grip, but I'm wondering if this will build bad habits in a new gun owner. if I train with it a lot, will it cause an odd draw stroke, specific to the holster, not easily transferable to other models/positions? Or should I be fine? via /r/CCW http://ift.tt/2fJELkH