IMO to try to describe it, at least imo
Tier 1- This has grown. Moves from 3-4 teams to about 12… But at the current moment maybe not the Super 2011 UM, couple bama, 2019 LSU type team.
Tier 2- About the same, another 15-20 good teams…Lose some to the top, but some upgrades from below. Basically teams 15-35.
Tier 3- The middle. Kinda getting raided, definitely smaller than before or if you want to describe it using the same number of teams, the quality is worse… Lost kids to the top. Bad but not terrible p4, and a few top 5.
Tier 4- Larger for sure, imo there is a lot more of this…average g5 teams, and your very poor p4.
Tier 5- About the same size wise, maybe slightly bigger, but overall quality has dwindled to even worse, and the bottom 5-7 are worse than ever. Overall this group is about 12-15 teams.
JMO, what I'm trying to say is the top group is bigger, the middle has gotten raided, and the very poor D1 teams are the same numbers wise, but worse quality wise.