This wasn't the first the subs outplayed the opponent for a stretch. Time to cut those sandbags loose.
No, the players you are calling "sandbags" are very much needed. Not helpful to the task at hand to disparaging label them.
This is the new version of, "We will only go as far as Gilbert & Carlton play well," in which they can & must be a valuable supplement to the emerging young players. This is the time for Vital's energy to be channeled into his evident and undeniable strengths at disrupting passing lanes, chasing down the ball, positioning for & grabbing rebounds, and making free throws with remarkable consistency.
This is the reality of the most optimistic scenario. Don't cripple it by reinforcing your displeasure with the prior weeks & years. You can't afford to create a ripple effect. YOU are a Boneyard equivalent to "Senior leadership." Same applies for anyone whose join date is August 2011 (which usually means longer or much longer).
There are only 9 scholarship players. You've been here too long and know too much to not know that a solid collection of moving parts is needed. This, whether you like it or not, is *your* time to model maturity and adapt to a new role, just as the players you are criticizing need to do. This is the stuff of mojo.
PS - A second-half, mid-game, 12-0 run to take the lead distinctly exceeded the prior hints that the subs could outplay opponents. Don't undercut the possibility in this with too long a backward look at what you didn't like. That's not how the mechanisms of breakthrough growth work.