Negotiating an Injury Settlement and filing a grievance are 2 very different things. If he really wants an injury settlement, he could probably get one. Then he won't be paid for the rest of the year and will have to hope he catches on somewhere else (risky for a rookie kicker who has shown very little so far.) Filing a grievance would indicate that he wasn't injured at all could be playing right now, but the Bills are trying to stash him away for next year. I don't think that's the case.
I disagree. I haven't heard anything to indicate a healthy player being IR'd recently.