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and they often are because you can just throw fades to the outside. Braylon was a major deep threat because he had good speed and could high point the ball, so he would not be considered a strictly receiver in college. Junior Hemingway and probably Funchess fall into this category of tall guys that aren't short route guys but they weren't as fast and Braylon.

Gallon, Breaston and Roy Roundtree were sort of speed slot guys in that you want to hit them on the run whether on a post or a slant but they were short so you'd throw fewer fades to them (although Gallon could jump so high and high point the ball that we started throwing him a lot of fades). McDoom seems like he's next in line here.

Chesson and Manningham fall in between the previous two categories because they were(are) tallish enough to run some fades but also fast enough to go deep and versatile enough to play some slot and run slants, etc.  Def not strictly possession receivers.

Possession guys are typically slower but great route runners with great hands who run a lot of 5, 10, 15 yard routes for first downs, hence calling them possession receivers.  Taller is better but you can be a Drew Dileo/Julian Edelman/Odoms type if you're quick in your breaks and catch everything.  Avant, Darboh before this year (he added a deep element to his game this year) and Marquise Walker also fall into this category.

If you're asking about purely fast deep threats, I just don't think the game is played that way anymore. Instead of just going to your fast guy on a bomb every ten plays, teams get them the ball in space on shorter screens and slants and let them run after the catch more.  Gallon and Chesson being good examples. Super fast but used a lot of different ways.

Btw, I just read that Desmond only had 62 catches for 985 yards his Heisman winning season.  My has the game changed in just 25 years.  The top receivers nearly double those numbers now.