You are comparing situations that couldn't really be more different.
Stallworth was already well know here in 2007, had one negative incident, and was brought back for one game as a short term depth addition.
Gordon has been a habitual offender just about every single year from his days at Baylor, quit on his team by refusing to show up, is in and out of rehab all the time, puts all of his personal issues before football, and has a SERIOUS drug problem--even if you want to minimize the specific substances as "just" weed and alcohol.
If Gordon were to get his life in order, prove that he can actually stay on the football field for awhile etc, then Belichick may give him a chance. Any talk of it now is completely and totally asinine.