There is no denying that Carroll wants players to feel like they mean more to the organization than numbers on a spreadsheet. This is for good reason because, aside from the intrinsic satisfaction it surely brings him, people also perform better when they're working toward a higher goal.
Carroll has taken specific actions to develop this feeling, such as flying out draftee's moms for Mother's Day and paying Browner an uncontracted bonus. It strains belief to think they do these things without partly intending to keep and attract higher value players for less money than other franchises can. This is part of selling the franchise and Carroll's success at this has always been his biggest advantage over other coaches.
So, how the decision on Mike Rob fits into this framework is extremely interesting. For my part, I think it does more damage than any goodwill Browner's bonus bought. You can't usually err on the side of sentiment, and we've dealt with that reality well for the last few seasons. But sometimes you can (and should IMO) because sentiment is part of the story of a football team.