how they use to play him they've always had him in the inside and Mo and Carr on the outside.
Do you remember after the St. Louis game in 2014 when Mo was demoted and walked out of the complex for a day missing practice? That was because they had moved Scandrick to his spot and Mo to the bench (ie when only two CB's were on the field, it was Carr and Scandrick).
When the opposing team put in 3 WR's, they brought Mo in off the bench and put him back in his normal RCB spot on the outside and moved Scandrick inside to cover the slot. Orlando was in on every snap. Outside in the base and in the slot in the nickle/dime packages.
Mo only came in when teams used 3 or more WR's.
Presumably, that is still the case. Carr and Scandrick in 2 receiver sets... Mo, Carr and Scandrick in 3 or more receiver sets.
X was asking if anyone thought Mo is a better corner and deserves to be in the game regardless of package with Carr coming off the bench in 3 WR sets.
X assumed Scandrick is going to always be in because Orlando is not only the best corner on the team... but everyone in the Cowboys organization and around the entire NFL know that he is the best corner on the team. So, I'd say X was correct in his assumption that the question didn't need to be asked about OS.
So really, it is just as simple as should Carr come in off the bench or should Mo?