I rewatched the first three possessions of the SF game. For the most part the OL was playing on SF's side of the LOS. one play Taylor (who hadn't played much) got beat pretty bad resulting in a TFL.
On another play the Texans lined up with two tackles (Christian & Heck) on the left, Pharoah Brown lined up as the RT. They zone stretch it to the right (which doesn't make sense as it was 3rd & 1 and we had two tackles on the left .. I bet it was Mills call at the line to go right). Anyway, Pharoah Brown just doesn’t block the guy on the end, advancing too early to the 2nd level. The unblocked edge gets a TFL.
But all the runs were ZBS. Our OL played on their side of the LOS & I'm talking Christian, Taylor, Britt, Scharping/McCray, & Heck against Bosa & Armstead. A better RB would have been more productive on those first three drives. Ingram would have at least moved the chains.