Garoppolo had a reputation for being aloof in San Francisco, which would drive detail-oriented coach Kyle Shanahan nuts, particularly when, at points of the offseason, the Niners would have trouble getting ahold of him.
Add it up, and that's why I'm not sure he really fits anywhere as a backup. You need your backup to be locked in, and you need him to be healthy-and there'd be concerns, again, fair or not, based on his reputation and history in both those areas.
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