That Tisas strikes me as having more in common size wise with the old Ruger SR9. Then given a de-cocking safety.
If I'm right then this is not physically a big pistol. ....
Right, but I also see S&W 3rd gen pistol lines in there, and maybe BHP?
And you're right, if preppypro "needs" a holster at this point, an Uncle Mike's cheapo cordura special is probably the best option. Once he's an established club member, maybe he'll be able to try the pistol for fit in a range of other members' holsters. Aside from that, I can imagine a whole lot of frustrating trial and error to try to get a properly fitted holster. Or the "omnivore" holster option, of course.