This, not scheme but players. When you are light in the --- and 330 to 40 OL are pushing you, guess who wins?
The Rams game was not about 1-on-1 physical dominance by their OLinemen.
It was about the Rams getting the Cowboys DLinemen into bad positioning where they lacked leverage, getting well timed double teams and enticing the Cowboys DLinemen to take themselves out of the play from a positioning aspect.
Rams "anticipating" when the Cowboys DL would stunt and running into the gap created by the stunt.
Angle blocking when the Cowboys were stunting which gave the Rams OL the leverage advantage.
Enticing a Cowboys DLineman to run himself to out of the play by being in a position where there were multiple bodies between him and the RB. This freed up an extra OLineman to either double-team a Cowboys DL or get out to block a LB.
Obviously physical ability ability comes into play. A Snacks Harrison type DT is hard to run against regardless of OL scheme but the Cowboys offense has had success by just running away from those types of players.
When Bill Callahan was the OL coach (2012 to 2014), the Cowboys did much of what the Rams did this season. Callahan even pulled off the miracle of making Doug Free look like a legit run blocker by using similar scheme "tricks". When Callahan was able to use his preferred OLine lineup with J.Parnell at RT, the Cowboys OL was completely dominant.
Frank Pollack and then Paul Alexander made as the OL coaches that followed Callahan. They ran less zone and didn't focus on details the way Callahan did. Alexander tried to make too many technique changes in too short of a time frame.
Columbo just reverted back to the style/technique that was familiar to the players; however, his mentor is Hudson Houck who IMO never got the OL as a unit to exceed the sum of it's individual talent the way Callahan did or the way Tony Wise and Jimmy did in the early nineties.
IMO, the Cowboys should find a way to get the Rams OL coach even if that means making him the OC. He has an impressive coaching background but may always be limited because he punched a kid in the face a few years ago.