I agree with beanerz that what we need is stud big men with some decent outside skills as well. At a certain point in time, however, the switch needs to be made from making a potential NT player more well-rounded to driving his key skills through the roof. My personal experience with training Denny Hall (also ATG) was that at 23 his pops were a bit slow on the inside and he ideally would have been switched over to inside training earlier. Hopefully his current owner will be able to get him to his potential, but only time will tell whether I trained him outside for too long.
That said, I think Sammons passing needs to be addressed. I don't think players with less than respectable passing belong on the NT except under exceptional circumstances (ie our current dearth of big man prospects...). I would train a mixture of passing and his core inside skills. Assuming a modest 10 or 11 pops a year, you could have him at respectable passing and 14/14/14 in two seasons of training, you'd probably pick up a handling pop in there as well. At 22 his salary would still be very reasonable. At that point in time you could reassess.
If your team is trying to win, it's awfully hard to play a stud big man trainee at PG week after week while he tries to pop at passing. By training it intermittently over a couple seasons you can choose the weeks/games that you can afford to lose or are guaranteed to win anyways. Or you could just do what I'm doing and tank intentionally and not worry about it! (bring on the draft baby!).
cheers