Not really. It is likely that the Richardson of 10/24 is not the same one they saw in Fall Camp. Very plausible that Sam is in the high-growth stage that in 2.5 months he went from not being ready to earning an opportunity to see what he can do in live-action.
Also, the staff loses no more credibility by trying something different, than they would if they kept on doing the same but expecting different results.
Exactly 2.5-3 months can be extremely helpful just ask Jeremiah George. Jeremiah had the physical talent but it didn't start clicking mentally until this past Spring/Summer. The Coaches, CW, AA have all noticed that SR throwing abilities are greater than Barnett's (not sure about SJ's). In fall camp the only thing that made SJ & JB the contenders for the starting spot was the mental part IMO.
SR should be considered because JB & SJ have their shortcomings, neither is a complete QB.
SJ has decent passing abilities but poor decision making.
JB has decent decision making abilities but poor throwing.