There is no shame in red shirting. Reflects a team's quality depth.
IMHO, of a typical 25 man recruiting class only 2 or 3 true freshmen should be expected to play immediately, and only at either WR or RB. And that is due to the team's dire need at a position or the recruit's man-child status.
Everyone else red shirts. This gives them time in the S&C program, to learn the playbook & understand the traditions.
RS Freshmen & Sophomores contribute considerably to special teams & begin to enter games in mop up situations. Standout Sophomores get into the rotation a bit. Rotation is primarily made up of Juniors & Seniors, with a few 5th year Senior silverbacks still around.
Been a long time since we looked anything like that.