In light of future Hall of Fame quarterback Philip Rivers' decision to unretire, subsequently joining the Indianapolis Colts' practice squad after they lost Daniel Jones to a season-ending Achilles tear, there's been no shortage of discussion and speculation (for 31 other franchises) about which team greats could potentially take a similar path.
The San Francisco 49ers, of course, have no shortage of names who'd fall into such a bucket. And one of them has already been there before, Hall of Fame linebacker Patrick Willis, whose own shocking 2015 retirement created a subsequent buzz when later-debunked rumors surfaced a year later amid the Niners' own struggles.