No. 2: Doug McDermott
This may be the obvious choice toward the top of this list, but Doug McDermott isn't called "McBuckets" for nothing. He is one of the most efficient three-point shooters in the league and was a key component of improving the Spurs' shooting woes in the offseason.
Despite some concerns on the defensive end of the floor, he'll likely be playing in the starting unit alongside Murray, White, Johnson, and Poeltl. Like how the Milwaukee Bucks were able to hide some of Bryn Forbes' defensive shortcomings, this lineup or a similar one should be able to more than compensate for any of McDermott's struggles on that end.
More importantly, McDermott is a career 40% three-point shooter with a high basketball IQ and an underrated knack to find open lanes to the basket. The trajectory of the Spurs' offense will largely hinge on his ability to remain consistent from three and him getting some help in that area from one of the other starters.
Given the starting unit's lack of proven shooting at this point, though, I think McDermott could have himself a very good year if he remains assertive with his shooting. He needs to be the team's go-to guy in the starting unit to hit a three and I fully expect him to be the most efficient shooter in the starting lineup. I would like to see him attempt seven or eight threes per game, similarly to White, and hit around 40% of them.