You don't get "free" spots in your 85 because you have a larger class. It is "not" true. The "average" player rating is the best measure of the quality of the class you are signing ACCORDING TO the recruiting sites.
A 3.5 star average on Rivals means that you "average" better signees than a 3.0 class.
I'm not sure where you are disconnecting here.
If #1 oranges average 14 oz and #2 oranges average 11 oz then #1 oranges on average are LARGER... even if you have 500 lbs of #2 oranges and 100 lbs of #1 oranges. And if you can only inventory 1000 oranges... you get more weight with #1 oranges than you do with #2 oranges.
Again, I'm not sure what's confusing about this.
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The problem with over simplification of math logic..... So If we only signed one 5 star and one 4 star and had an average of 4.5 our class would be better than a class of 25 4 stars? That also assumes in this discussion that the 3 lower rated guys that drag a class down have no better chance to be contributors than AIR.
Once again an over simplification in your analysis. They are not just weighing these guys. They are also applying the eye test, as they should, and on top of that they heavily use the measurements that are a year or two old to establish their initial rating even with SOME adjustments, they don't like to drop too many out of their ELITE 247, 250 or 300 and some guys that come out of nowhere are capped as high 3 stars when in fact their last year shows them to be superior prospects, but lose the body of work component.
The biggest hole in your analysis is that in the pure math model the highest rated 4 star and the lowest rated 4 star, some 200 spots down the list, are valued exactly the same. Same for the three stars. But the last 4 star is not 25% better than the first 3 star. With the application of any kind of standard deviation of accuracy it is plain that AMONG the much more massive list of high 3 stars will be better performers than the plateaued 4 stars.
All that said, the Bama's and GA's are not blindly fishing in the entire 4 star pool but in the upper reaches and that is why their classes sustain success. But after we get in line and get our also highly desired 4 stars, we are fishing down the 4 star pool and in the upper reaches of the 3 star pool where the talent levels project to be very very close by the service ratings and the risk/reward evaluations by our staff validates their probabilities and pass on some 4 stars and TARGET 3 stars. Once again this methodology is validated by NFL draft results as a valid plan of attack.
The trick is to get our talent close enough for gameplans, execution, bounces and calls to have us in the games we play uphill. Same for those with lower rated classes than ours on our schedule. Can't know till you hit the field. Our staff may well assess that the guy we sign does not project as high as some of those our competition sign, but that he closes the raw talent differential and that can be made up by effort, fit and execution. Take our oft discussed DB situation this year. I think all the guys committed help us get better, just don't know how much better and whether they are better than those signed by our competition.
Bottom line, star comparisons are a place to start, but not an end on signing day(s). Especially with brave new portal world available to fill out your roster. I will start with the position that any guy the staff DOES sign has great promise or they would pass and be looking more to the portal to complete our 85.