Didn't SF play some man ?
Probably some, but they are bottom half in the league. They were 17 by the time they played Dallas, 22 when they played Giants 2 weeks ago. So the progression upwards makes sense as the QB position of those two teams was in doubt, especially with DJ and the Giants OL not being able to block anybody.
My point is I don’t think this man was much an influence, as they basically only moved the ball and scored a TD against man coverage on Turpin and the play before it I believe. SF is a heavy zone team.
On the other hand Dallas is at number 2 right now in playing man, while they were 1 for the majority of the season.