Crucial bone-headed plays as well as poor, ineffective, and terrible late in-game coaching decisions along with questionable substitutes, injuries to key players like Kittle, Kinlaw, and IIRC, Fred Warner during Super Bowl 58 helped Mahomes and Reid pull out late, come-from-behind wins especially last year vs. 49ers in a near 2OT Super Bowl instant classic. In both of their SB losses to Chiefs, S.F. were winning going into the 4th quarter or had multiple opportunities to close and ice the game but didnt properly take advantage of good scoring opportunities or just turned it over. In essence, they just choked at the worst, inappropriate time.