It's a combination of things..
I think loyalty is also a big part in this..
Hairston is 22 years old..he just made his first NBA cut, he's significantly improved already, and will continue to get better..he's gonna have a lot of time in the NBA..
We talk a lot about Duncan's last run, but this is likely Finley's last year in the NBA..if we're going to make a run, I highly doubt Pop puts him on the IL for the duration of it..he's too respected on this team..it looks like we're starting to see his decline in minutes though, so at least that's a positive..
Mason signed last year with aspirations of competing at a high level with this team..I highly doubt Pop would put him on the IL just a season after Mase had a surprising regular season and helped us win some games..
Hairston is a better player than Finley IMO, I don't see how he couldn't be..I don't really believe Finley is still an NBA-level player, just an NBA-level shooter at this point..Mason is a 1-D player that is currently in a slump, only preferred over Finley due to his age..
I hope he plays, he's a better fit for this team and can fill a need better than either Finley or Mason..loyalty will be key here, so I doubt Hairston gets his shot..I believe the FO believes he can already play though, which is why they kept him when they didn't have to..he's already an NBA-level player with a lot of upside, and already has good chemistry with our other young players..