Summary
Collins had a very promising start to his career, but since then his career has been derailed by injuries. He only played in 11 games in '19-'20, missed the entire '20-'21 season, and missed the majority of the '21-'22 season as well. However, during the final stretch of the season, he was pretty production and looked healthy, which is a good sign for him going forward.

Collins is similar to his surname counterpart who was also taken in the 2017 draft, John Collins, as he's a bit of a tweener between the four and the five, although I expect Zach Collins to be almost exclusively a center going forward. He demonstrates really nice verticality at the rim, which was a skill he had even coming out of Gonzaga. However, he hasn't quite developed the defensive instincts and awareness to be one of the better rim protectors in the league. He's also not a great defensive rebounder, finishing well below average for his position in defensive rebounding rate, per Cleaning the Glass. He's hurt a little bit by his skinny build, as he's not quite long enough to make up for his lack of bulk, in a way that someone like Rudy Gobert can.

On offense, Collins is a capable shooter, but his numbers certainly don't put fear into defenses, as his career three point percentage is under 33%. He also doesn't finish all that well at the rim, as he has consistently been a below-average finisher inside. Collins does have promise as a big that can protect the rim, stretch the floor a bit on offense, and also be a vertical lob threat. However, injuries and some lack of star upside could make teams pause before giving him a sizeable offer.

If Collins can stay healthy, he will likely live out the remainder of this contract, which is partially-guaranteed for '22-'23 and non-guaranteed for '23-'24.
 
Cap Considerations
Collins's $7.35 million salary for 2022-2023 is only half-guaranteed, and if he is waived he will become an unrestricted free agent and the Spurs will have no form of Bird rights on him.

If Collins becomes a free agent, other teams will have multiple ways to sign him as even teams without cap space could possibly use the Non-Taxpayer MLE, Taxpayer MLE, or possibly even the Room MLE or Bi-Annual Exception to sign him. I also wouldn't rule out Collins only getting minimum offers if he continues to struggle with injuries.