Good point,
I tend to think more of RB or even RSV during a Vacation month, but there's certainly the potential for a trip to fit into the RA window.
Just pretty unlikely, IMO.
Barring First fly, tend to be pretty far down the leveling list so my expectation is a late morning DH assignment-still certainly has the possibility of fitting into an RA block, but more likely a next morning return
Bottom Line is CRS will NOT build a Single R day block, unless that's their only option