That's completely unfounded! Finley at his prime was better than Mason in his prime (i.e. now). Unfortunately Father Time has caught up, Mason without a doubt is not only a better shooter but a more versatile player than can play point and penetrate. One other thing, Mason can hit the shot off the dribble... not happening with Finley.
Besides, if you want to have a player that did exactly what Finley did for us (that is do nothing but camp on the 3 point line), then you've got Bonner, Udoka, Bowen and Tolliver to do that.