Close.
It was a 3-4 zone.
The Texans were in single back, double TE set, with two receivers on either side.
Cooks (the X) simply runs a seam route while the other receiver (the Z) runs a crossing route underneath him. It was just a two-man route; the other 3 skilled players were basically at home to block/draw the attention away from the LBs.
The crossing route by the Y, from my understanding, is to try to draw the FS up, leaving Cooks alone in one-on-one with the RCB.
As it was, the FS never bought the shallow route and stayed home.
This, IMO, should tell the QB to either go with the corner route to the X or the shallow crossing route by the Y (depending on the depth of the RCB).
We see this route a lot, not just with OB, but with other teams, and at the collegiate level, too.
The fact that Cooks started to turn to the outside to look for the ball was also telling.
He was expecting the ball to go to the outside.