Certainly agree on playing them more than one play. That was unfortunate for both CM and RJ. The CM episode has been discussed and was an error that occurred in the heat of the moment. The RJ game is a little less excusable and i think all involved wish RJ would have gotten more involved. However, i would ask you, of the players that played 4 games and kept their redshirt.....did any of them seem to show they could have made the difference in the outcome of any game? I certainly didn't see it.that's certainly possible as well. unfortunately, it does happen. doesn't necessarily mean the coaches need to be fired though. you'll never get a coach to admit that.
we saw this season on a few occasions where players being planned for redshirting were put in the game for only one play, only to regret it later. there was at least one time this season when they had to wave a player off the field who was meant to be part of a specific play package, but then a senior player had stayed on.
point is, if you are going to get young players involved in games which are not complete blowouts, then you will have to be particularly intentional about it, especially if you feel they are "ready". there will never be a "right moment" if its not a blowout.