Shopping the former second-round pick makes sense for the Rams. Zac Stacy proved last season he is the starter and can handle the bulk of the carries. Mason presumably can be the change-of-pace runner that Pead was supposed to be coming out of Cincinnati. Daryl Richardson will likely be the third option.
The 50th overall selection in 2012 has just 17 carries for 75 yards, 14 receptions and 15 kick returns in two seasons. He might be given a chance to remain in St. Louis if he can prove his worth on special teams. It's likely, however, Pead's seen his last down in the Rams' backfield.