There's been a lot of questions about how the NCAA will handle returning seniors (2020 seniors returning for an additional year). They won't count towards the 85 cap, but apparently them staying will have an effect on teams getting a lot of mid-year enrollees (early enrollees). Here's a comment from Kirby Smart about it:
"Everything doesn’t mesh…let’s say we have five mid-years, which isn’t the case at all, but let’s say we have five mid-years that want to come," Smart said. "We have to have a spot for every one of them to come, so every senior who elects to stay, we don’t have a mid-year spot. So, even though [seniors] won’t count towards the 85, we don’t have a spot for [mid-years] to come. We don’t really control what seniors stay, and we’ll certainly give them the flexibility, but if we have more mid-years that want to come than seniors who want to leave, we have a problem. I don’t think that all the things mesh real well, especially if you’re a program that has a shot at a lot of mid-years. What’s different about this year? Kids aren’t in high school, so why should [they] stay for [their] second semester? We’re looking at—and I don’t know about other schools, maybe they’re the same way—[but] we’re looking at the possibility of anywhere from 14 to 20 mid-year enrollees. Let’s say we have 20 mid-year enrollees who want to come—we don’t have 20 spots. Yet, the seniors won’t count next year, but they’re eating spots right now. It just doesn’t add up. It doesn’t make perfect sense, so it’s a dilemma that we have to deal with."