if Patriots,Chiefs or Saints sign him he could really do some damage.
I agree especially if he hends up in NE. I am sure if he went their he suddenly be healthy again and perform at his old level. That is just how it seems to work with the Pats.
Other teams to watch out for because they have cap room to burn is Cleveland (and all of the GB connections) and the Jets who need offense badly. Buffalo also is desperate for WR help but not sure if they have the cap room or if anyone would want to go there.
As for the Saints I think they are pretty close to right up on the cap so not sure about them but if you put him with Brees? look out.