Hill showed some hints of offense, but he did show consistent defense and he did show the ability to get other players involved. He'll be fine - I think everyone forgets that Vaughan was limited to that above. Hill will be a better scorer - not an issue.
Also, Hill has shown the ability to get into the lane in the Summer League, he has a good first step. He didd struggle finishing for the most part but he did have a couple of nice moves where he was fouled and still finished. But hes a late first round pick, hes gonna have his deficiencies, its a matter of how/if he overcomes them.
Tolliver is a question mark, but he is long and if his outside shooting continues to improve like it has he'll definitely be an asset. You can't teach length, but as some players that have come to the Spurs you can teach defense.
Gist has too much athletic talent to not make the team. He runs the floor well and his ability to jump quickly is rare and valuable.
Ian will be fine if he's given a chance. Everyone knows that he has raw athleticism, but no one's ever seen him play with players like Duncan, Tony and Manu. My point is that if you put him in a scenario where he's a mop-up type of player (offense and defense) I think he'll show his worth.
Udoka will be better - he showed improvement during the last half of the season even though he sputtered in the playoffs. I give him a pass, since that seems to be common with most players that join the Spurs.
Mason is unknown, but he obviously impressed our FO enough to make such a quick move to snatch him up after we knew we wouldn't get CM. He just needs to be adequate on D and hit open shots. If he gets 10 ppg with us, then he will be a success.
Our bench was pretty mediocre last year and getting some effort, speed and athleticism out it this year will be an obvious improvement over last year. I think that you would have a tough argument (at this point) that our FO didn't address those weaknesses. There's probably one more move to make (Finley or another FA,) but I think our roster has improved.