Yeah the shooting guard types are almost all exceptional athletes, I was talking about power forwards but you're right there are a lot of guards who are better athletes than the power forward types and who are still huge by NFL standards. And for purposes of roster spots while they learn they simply need to be able to contribute on teams so they'd have to be dudes willing to get their hands dirty, guys with a bit of an edge to them if you will.
You know for that matter this is something that I find interesting with the NFL, that they rarely run conversion projects among even the bubble players who are essentially special teamers. But you see it much more often at the college level, where players switch over and then sometimes a season or two later they're in the draft. It's not like it is going to solve all your problems or anything, but when you get to the latter stages of the draft I would be looking at potential positional change opportunities in an effort to increase my chances of finding late round gems.
I mentioned before about having TEs (who are typically big and athletic) that fall into the late rounds do QB workouts in order to see whether any of them have throwing potential, and most peeps around here thought I was nuts. But there are a lot of examples of other positions like big wideouts who aren't going to cut it at the NFL level moving to defensive positions be it safety for the smaller types or even something like rush LB for the rangy types who can play with that type of mentality.
I realize I'll get plenty of "well the NFL is not the level to convert players" type replies, but I think it is a way a team could get more from their late round and UDFA additions. Practice squad gives them a little more leeway on this too.