I'm not really sure if you're actually serious but I'll go ahead an correct some of the misconceptions present in your posts as if you are:
FCS programs go with 63 scholarship players.
The average team size for the FCS, FBS, and Div II schools are 101, 118, and 109 respectively. FCS programs are also allowed up to 30 players counted toward their yearly 'counter' limit whereas FBS programs are only allowed 25 (with an allowable oversigning limit of up to 28). This, in addtion to equivalency rather than headcount (which I'll go into in a moment), gives FCS programs a little more flexibility in shoring up low roster numbers at a much greater clip.
D2 and below teams like UCF go with 36.
D2 & FCS teams use a different scholarship model than FBS teams are allowed to use. Instead of the headcount model where it's one player per scholarship, they're allowed partial scholarships. In essence they're allowed to split a scholarship between two players and that counts as '1' for their respective scholarship limits. With the much smaller athletic department budgets the the smaller scholarship limits help keep costs manageable as well as ensure a more even playing field. Much like the reduced scholarship limit of 85 has done in FBS/Division 1-A football.
Even the NFL plays 16 game schedules plus playoffs with 53 man rosters.
Because men in their mid-twenties to thirties who have been refining their craft for over a decade, including their time in college, are the same as someone just coming out of high school right? A lot of scholarships at all levels of play are tied up in young players that will never see the field. NFL rosters are all players that will see some playing time or are important backups. The NFL also allows an additional 10 players on the practice squad that don't count against the roster limit. That 10 also doesn't count any international players which can be in addition to the practice squad limit if their place of residence is outside the US. In addition, teams can add/drop personnel throughout the season and there's the injured reserve list, which frees up a roster spot in event a player will be out for an extended period. Hoo-boy, that roster of 50+ veteran players sure is sounding restrictive now!
I acknowledge it's low by FBS standards. But I'm also saying FBS roster sizes -- 85 scholarships plus however many walk-ons -- are kind of ridiculous.
Tell that to the schools that have a ton of attrition to the NFL over a short period or see a bevy of injuries at important positions. Hope those freshmen are ready to play!