Luck may have caused the Lions to lose all of the 17 point lead so suddenly in the 3rd quarter. But luck isn't what lost them the game. If the Lions are good enough to outscore the Niners by 17 points on the road in one half (imagine how angry Niners fans were at halftime for "coming out so unprepared for a huge game at home to be boatraced by an inferior opponent"), a desperate Niners team was good enough to outscore the Lions by 17 points over the course of a full half. The only real luck I see during the Niners comeback is the Aiyuk catch. The first 4th down drop, the Gibbs fumble, the second Reynolds drop, failing to down the punt at the 1, the 1st down throw into the endzone going through Jamo's hands, Purdy scrambling on 3rd and 4 with 5 minutes to go ... all that is down to skill/execution or lack of.