Since the Draft was instituted in 1936 311 Texas players have been drafted.
There is no exact numbers as to how many players are in college football with just one kidney.
While many NFL players are drafted from college, a college degree (while beneficial) is not required. What is required is talent and someone (scout) from the NFL to notice that talent.
It varies from year to year. Not all drafted players make the team, and not all free agents stick. There is also a practice squad.
Each year between the months of February to April about 300 nfl draft eligible collegiate football players declare to enter that years draft class....But only about 200 of these 300 college players are going to get drafted/picked by an NFL team. Then out of these 200 college players that were drafted only less than 75 % get offered a professional contract by the team that drafted them.
The exact number of Division 1 college football players is unknown. However there are a total of 80,000 college football players across all divisions.