Why can't it be as simple as the fact that there were 5 other receivers better than him and, when forced to cut the most dispensable player on the active roster to address a critical need at OL, the team did the entirely logical thing of cutting the most dispensable player on the roster.
The vested interest in someone who made an extremely marginal impact last year and then promptly got beaten out by 5 (FIVE) other players at the same position is remarkable. Truly remarkable.