In a way, it’s similar to Kaepernick. Most all agreed Kaepernick was good enough to be on an NFL roster as a backup, but you don’t want drama with backup players. A team can put up with it to a degree with a starter and contributing player but they won’t put up with it from someone not on the field.
Sanders is not good enough to be a starter so why would a team be anxious to bring in what surrounds him?