ON DEFENDING OFFENSES WITH 2-RB SETS...
"That is something that is becoming more and more pervasive in presentation to what people are doing on offense, but how you defend it depends on the diversity of the players who are actually making those two-back sets. I also think one of the things that people are doing more with two-back sets are using the Y as an off player, so they're actually creating what I refer to as three-back runs. So, you have three people in the backfield and the Y is a blocker. The keys become different. The formations are a little different, but it's just a part of what we do now. Most people who do it still maintain spread type elements in what they do, whether they still do RPOs or boots."
https://247sports.com/college/texas-am/LongFormArticle/Nick-Saban-opens-up-on-Alabama-football-rebounding-from-rebuilding-year-Bill-OBriens-evolving-offense-190910002/#190910002_2
"That is something that is becoming more and more pervasive in presentation to what people are doing on offense, but how you defend it depends on the diversity of the players who are actually making those two-back sets. I also think one of the things that people are doing more with two-back sets are using the Y as an off player, so they're actually creating what I refer to as three-back runs. So, you have three people in the backfield and the Y is a blocker. The keys become different. The formations are a little different, but it's just a part of what we do now. Most people who do it still maintain spread type elements in what they do, whether they still do RPOs or boots."
https://247sports.com/college/texas-am/LongFormArticle/Nick-Saban-opens-up-on-Alabama-football-rebounding-from-rebuilding-year-Bill-OBriens-evolving-offense-190910002/#190910002_2