For UK, I can see Patterson (really only played 2 full seasons) and McKinney taking advantage of that extra year. If they could get some size, they will be a top 3 team in the SEC next season.
TAMU will be a rebuilding year. I can't imagine a scenario where their seniors decide to come back. Same is true for the seniors at Tennessee, but they have more pieces returning and some interesting prospects coming in next year. UGA will be in rebuilding mode too, but they have some talent coming in next season as well. Arkansas will look very different, but will stay in the top half of the SEC standings with Eaton and Wolfenbarger coming in, along with Daniels, Davis and Barnum returning. LSU and Alabama will both be gutted with the loss of their best players.
There will be transfers for sure. I've already commented how there should be quite a few from MSST. As the rotation at SC settles with the freshmen coming in, I wouldn't surprised to see a transfer or two. Same with UConn out of conference.