It's kind of interesting how their career arcs are similar. Both were recruited as speedsters who could spread a defense out, but they ended up as physical, chains-moving forces with 99 ratings for hands and "lead by example" kind of dudes.
I remember Quan talking about how disappointed he was as a freshman during the national championship season because he was older than all of the other receivers and thought he should be getting #1 reps, and how Mack/Greg had to talk him off the ledge and get him to set an example for everyone else. Selfless dude and his hard work paid off with one of the biggest games and TDs we've ever had in the Fiesta Bowl.