McDonald wrote that as if Finley would be the starter if he returned. I highly doubt that is the case.
Ginobili will likely begin the year as the starter and Mason will compete for backup minutes at shooting guard. Mason played point guard in Washington but I don't see him playing much point guard in San Antonio. Unless Hill sucks in summer league, I fully expect him to be the backup point guard. Pop seems dedicated to using Hill in that role.
Mason may eventually start at shooting guard when Pop sends Ginobili to the bench at some point next year, but Mason won't be handed the starting job out of the gates.