Bradbury is a turnstile nowadays (see playoff game vs Rams). I hope they don't have interest.
The question I would ask is is he better than Olu? If so, then sign him. The coaches and JS have said they want to be a run first Offense and Bradbury is a pretty good run blocker in this scheme. Pass blocking not so much, but they can always draft a or sign Fullback who can block. Oh, yeah there was a FA fullback from SF who re-signed with them but was on the market for a few days but they couldn't see that if Shanahan could use him in this Offense, he would be of value.