Taking off my gold tinted glasses:
Nealy - if he shows out against other teams like he did during the spring, he could be drafted. Given the freaks at LB these days, Nealy would have to really test well at the combine or pro day to be drafted in the first 3 rounds. Brandon Watts is a perfect example of this. I think Nealy is the better overall LB, but Watts has next level measurables in terms of testing and he was taken later in the draft. Nealy is definitely a draft candidate.
Golden - right now he'd be considered a special teamer only as he hasn't shown enough playing in the secondary to be drafted. The NFL rarely drafts players just to play special teams unless they have an elite skillset returning the ball. Those guys usually go very late in the draft if at all. The NFL can put reserves on special teams, so unless Golden proves he can play in the secondary at a high level he'd be an UDFA candidate.
Gotsis - at his rate of development, I can see Gotsis being drafted in the mid rounds. 3-5 rounds is possible for him since he gives position flexibility as a 3-4 DE or a 4-3 DT. He's also quick off the ball and very athletic for a DL. Gotsis's best playing days are still ahead of him. NFL loves big guys like Gotsis who has a ton of upside...and given that Gotsis really just started playing the game, that's pretty much the description of him. Needs to get stronger, especially at the point of attack, but you can't deny he can disrupt the QB and bring pressure.
Isaiah Johnson - from the last few years he played before injury, it's hard for me to see him getting drafted. Does not read the game well for a safety, and often took bad angles and doesn't have the speed to catch up once he realizes it. Once defenders got past him, didn't have the recovery speed. Not a great tackler for a safety either. I hope a year watching the game and another year under Roof improves all those things. Right now, he's more likely a NFL camp invite.
Zach Laskey - probably moved to fullback or developed into an H-back on the next level. Great size and speed for NFL fullback and H-back. Does not get negative yardage, but runs kinda high. A great receiver out of the backfield. Can also provide value on special teams. Right now, given that guys like Dwyer and Anthony Allen were both late round picks at the BB position, and given his projection as a fullback or H back at the next level (those guys don't get drafted high), he'd be a late round pick at best but most likely a UDFA.
Shaq Mason - undersized for an NFL guard. NFL guards are usually in the 6'3-6'5 height range and 300+ lbs. His lack of sophistication in pass blocking will hurt him. Probably best in a zone blocking system where they put a premium on guys that can move and get to the next level...usually smaller athletic linemen. If he gets drafted, it'll be a in the later rounds. Most likely an UDFA, and will likely get a chance in someone's camp.
Smelter - Right now, he's more of a 2nd or 3rd receiver in the NFL. Tall big guys like Smelter used to be the exception, but now they're becoming the norm. Needs to show better speed and explosion off the ball. Great hands, and knows how to locate the ball at the highest point to bring it down. Doesn't show the elite physical skillset that BeyBey or Stephen Hill have, so it's hard to see him going high in the draft, but he's definitely a draftable player. Will get dinged for playing in this offense and running an NFL route tree on this level (as both BeyBey and Hill got dinged for). Elite blocker on any level which does mean something to coaches. If he can show more speed, especially at the combine or at pro day he'll definitely improve his grade. Right now, he's more of a round 5-7 round guy.
Waller - inconsistent, but when he's "on", he's very difficult to cover and has shown flashes of being our best WR at times. For a guy blessed with his size and jumping ability, doesn't use those attributes very well. Has deceptive speed, and will probably test pretty well at straight line speeds. Even 4 years later he's more potential than actual production. If he can show the consistency he did the last few games of the 2013 season, he's going to be a draftable player IF he also tests well. Right now, he's a UDFA.
I hope I don't sound too negative about our guys...just being realistic and judging our guys compared to the other draft eligible guys the NFL people will compare them to. We have to look at the draft not in terms of what we see as GT fans, but what NFL people look at compared to the hundreds of other guys at their positions. Out of all the college players available, only something like 200+ players get drafted.