The new reality in college football is that your roster is going to look drastically different year over year. Not only do you have to recruit new players, you have to re-recruit your own guys.
Every program is going to have a dozen or more players enter the Transfer Portal after the season. You have to have that kind of turnover so you can find your own portal gems. And not many have utilized the portal to greater success than Deion Sanders. He flipped the Colorado roster immediately upon arriving in Boulder and turned a program that was a doormat into one that could contend with anyone in the Big 12.