Colt is one of those athletic "freaks", 6-4 250 runs a 4.5, and immensely powerful. The Ducks have used him as a power runner and he just runs over people. He was under utilized in the Ducks offense, but is the most athletically gifted TE in the nation. He apparantely has a history of alcohol/substance abuse and was suspended for his actions.
Take a look at this vid of him jumping onto a 62 inch high stack of blocks.
Anyway, now that he's quit, his NFL stock will certainly plummet. He could be a nice pickup for the 49ers. He could be our Delanie Walker.