Vs. 1 High probably depends on the leverage of the DB and they can mix it up with the WR split. The frontside vert/comeback/deep out can be whatever you want. Like I mentioned, to me personally, it's a gift/matchup route only. But vs certain looks you can convert the go into an out breaker or run a corner from an inside release then vert press.
ACTS is a DG term for QB progression. I'm a big proponent of it. A = Advantage route - some route in your concept that forces the defense to do something to take it away. C - Concept reading something within the structure of the defense, sometimes it's a 2:1 or an option route. T = Third fix - which is basically a complement to the concept if it is taken away, you got to, typically a check down. S = Scramble. If those are all exhausted, it probably means they have 7-8 in coverage and you can escape for yardage.
All of this is predicated on the belief that we should be able to beat someone given a two-way go.
Below is how we teach our Y-Cross. Basic fake zone play with bubble to the keep side, half-slide pass pro with the TB responsible for the S.
Advantage - Locked Seam, 1st in the Post-snap progression, we know vs 2 high it's dead, vs 1 high it's live. But somehow the defense has to honor it from the F, or the deep $. If it's a 1 high structure, it basically becomes an either-or throw. We're throwing a hash. Free works frontside hash, we throw the backside skinny post, if not, Y-cross. If it's 2 high, we progress to the Seam Reader.
Concept - Seam Read. This is the key route for us. We assume our guy is going to beat the corner, if not, we suck and won't run the concept. The seam reader is going to take inside leverage, work vertical and at 10 yards is his decision depth, is he staying skinny, bursting vert, or digging in. Break at 14 yards. He works off the $, if it's 1 high, he'll stay vert, vs 2 high, he'll work skinny to dig @ 14 yards. QB reads the backside $ and knows where the Z will break based on the $'s positioning. If the Sam LB wants to drop into that dig window, that's when the third fix comes in.
Third Fix - Check down, TB will check down 3x3 from the Tackle and get underneath the Seam Reader, basically creating a hi-lo on the Sam. If all of that is covered, comes the scramble
Scramble - Get yards and beat the Mike.
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I'd prefer to get the Y-Cross to the frontside hash, they don't here, and I'm guessing it was some sort of gameplan/shot type play based on the reaction of the FS safety initially. I'd say the positioning and hips of the $ said to throw the backside hash.
We were fortunate to have a really good QB, slot and outside receiver several years ago, and we made a living rocking this concept and 4 verts, which we treat the exact same as Y-cross out of multiple 2x2 and 3x1 sets.