Here is the Phil Steele site where he lists returning % of tackles coming back.
https://www.philsteele.com/Blogs/2016/JUNE16/DBJune20.html
Alabama is showing 53.8% returning. Here is how the rest of the SEC stacks up.
Arkansas is #1 in the country with 86.76%...followed by:
#13. Tennessee - 79.72
#14. LSU - 79.64
#18. aTm - 77.99
#31. Vandy - 72.44
#41. MSU - 69.04
#44. Missouri - 68.28*
#85. Ole Miss - 58.76
#86. Florida - 58.67
#99. Georgia - 54.43
#103. Bama - 53.38
#107. Auburn - 51.69
#112. South Carolina - 49.74
#122. Kentucky - 41.43
Note...these calculations were made on June 20th...before Brady and Brantley were dismissed. By removing Brady's 40 total tackles from last year, it would only drop Missouri's returning tackle % to 63.71%, which would drop them to #62 on Steele's list....meaning that they would remain ahead of Florida, Georgia, South Carolina and Kentucky in the East.
By comparison to last year...Alabama was #64 on Steele's list with 63.28% returning for 2015. Missouri was #60. They both seemed to do pretty well last year.
http://www.philsteele.com/blogs/2015/JUNE15/DBJune10.html