The other concern I have with Martin is that there were reported concerns about his personality. Now, without knowing the details, its hard to know how much stock to put into it, but I would be concerned, if the vets (KG and Pierce) are not all for bringing in Martin. This team has been really struggling to find chemistry, and I wouldn't mess with that for a guy with very questionable abilities at this point in his career.
If the players want him, then I think its worth the risk. But I am not sure if thats the case.