We HOPE Mason is a better shooter and we HOPE he has the ability to hit the shot off the dribble and penetrate, but wildbill2u's assertion isn't "completely unfounded".
Mason has had one decent shooting year, and really a good 10-game stretch where he started and was extremely productive. Spurs fans, most of which never heard of Mason before he signed with the team, are HOPING that he can recreate that production....but it's not a given.
If Mason does falter (let's hope not!) early and Udoka struggles to be consistent, the Spurs will need SOMEONE to pick up the slack. If it's Finley, the Spurs are screwed. But let's be honest, if it's anyone else....the Spurs are screwed.