great question and i did a quick overview of the frogs who were drafted in that period using the 247 database. numbers might be different with espsn, but 247's database is free and easy to access.
one challenge going that far back is tcu recruits are only rated back to the 2002 class. when i checked the player rankings for 2001 only 129 players were rated in 2001 and no player rated was given less than 4 stars so the texas longhorn class in 2001 that was ranked #11 in the country only had 4 players rated that year. compare that to the 2021 class where 247 gave 369 players a rating of 4-stars or higher and rated well over 1,000 kids.
specifically that means players such as anthony alabi, drew coleman, michael toudouze and cory rogers who were drafted in 2005 and 2006 weren't given any type of rating.
there are ratings for the players drafted in 2007-2014 and here are those numbers.
tcu signed 49 2 stars in the classes between 2002-2011 and 7 of those got drafted
they signed 96 3 stars in those same classes and 11 got drafted
finally the frogs signed 7 4 stars during that time and 2 of those got drafted
the 2009 tcu draft class had 5 players overall and 4 2-stars who got drafted in blake schluter, aaron brown, robert henson, and jason phillips. three of those players came from the same recruiting class in 2004.
not sure what all of this truly proves other than the holes in the ratings services simply because of the challenges in scale. consider that in 2012 tcu signed two 2-star recruits according to 247. josh carraway who missed a great deal of time to injury in high school and derrick kindred who played multiple positions (rb, de, lb, and db) for a bad high school team yet both ended up playing in the nfl or that in 2020 supposedly there were over 200 high school football players in texas who were better prospects than kendre miller.