And isn't it mandatory by NFL rules/CBA that if you poach a guy off another team's PS that he must be on the new team's 53 roster? In other words you can't just upgrade your own PS roster by taking a guy from another team's?
Correct, the player must be on the acquiring team's 53 man roster for a minimum of 3 weeks. Doesn't mean that Graham will actually see the field or dress for games.
The Bears current coaching staff evaluated Graham and weren't impressed with what they saw. Same with Duke Shelley, another 6th round slot corner pick they let walk.
Could also be he just isn't a fit in this scheme and he might work out in another. Both teams could be better that he moved. More then likely he'll not work out, most don't, but most players need the right scheme to succeed in the NFL