I don't think this guy really wants back in the NFL and I think new GM John Lynch (and probably other GM's) believe as much as well. I find Lynch's comments telling.
http://www.espn.com/nfl/story/_/id/19840805/colin-kaepernick-travels-ghana-independence
Niners general manager John Lynch said last week in a radio interview that he spoke with Kaepernick and that the quarterback wants to play in the NFL this season. He said he urged Kaepernick to express publicly in an interview that he is still committed to his football career.
"He is fully committed to wanting to be in this league. ... I won't communicate too much of what we've talked about, but I will communicate that I gave that opinion to Colin myself: 'I think you are having a little bit of an image crisis in terms of not so much what you did last year, but people are wondering, is this most important to you, at a position where the guys that succeed at that position are the guys that live it, breathe it, the CEOs that play that position.' And I think there is a perception that football's not on the top of his list," Lynch told KNBR Radio in San Francisco.
"And so, my communication with Colin was, 'Your best effort, I think the way you could best help yourself is to not have someone talk for you, not have statements, but go sit down and do an interview, and let people know exactly where you stand.' Because he makes a compelling case as to how bad he wants to be in the league when you talk to him.
http://www.espn.com/nfl/story/_/id/19840805/colin-kaepernick-travels-ghana-independence