I'm shocked, I didn't think Richt would start Perry for UNC but at least get him ready with split 1st team reps.
I think at this point it's beyond obvious that Perry's arm talent & upside is just higher than Rosier's & Richt probably feels this Offense can move more efficiently with Perry delivering the ball.
The biggest thing for me will be how Perry is used as runner, there's not a throw on the field Perry can't make but if we incorporate some Read option runs on the outside this offense can become potent.
Because if Defenses sit back in 2 High Perry will pick the middle of the field apart, if they go Single High we can beat teams on the outside with our speed or hit guys out of the backfield with Brevin or a RB. Then when those LB's start cheating up on the line, Perry can break a few runs, which will draw those Safety's down then JT4 will punish them down the seam.
The combination of arm talent, accuracy & ability to work the intermediate passing attack are the main factors that separate Perry & Rosier.