seriously - he'll retire as a member of the last team he played for
it's not like he is some all time great or a HOF type guy that will sign a nothing contract so they can officially retire as a member of a certain organization
with that said I think he will be remembered most for his time with the rams ... that's where his story broke, that's where he hit the limelight - under the best case circumanstances (for card fans) he may be able to get up to equal footing, but never surpass the recognition he got in StL