Great thread here!
No, I don't think the Days run is OSV. I think the similarity in the blocking is mostly due to the defensive alignment to the "tight end."
Though I agree that Justin doesn't appear to be reading anyone, my main issue is just with the footwork. QBs running OSV tend to take a 2/3 step path to meet the dive back at a spot that forces a decision from the defender. Just as the B gap forces the EMLOS to commit to dive or keep on ISV, the C gap (aim point for dive back on OSV) forces the OLB/overhang/whatever to commit at that point.
An "outside veer" where the actual mesh point was the A or B gap wouldn't demand much of a commitment at all - the overhang can't get to the dive back, but he can slow play the QB on the read and has time to change track in the event of a QB keep.
I don't think we'd run a "b-gap bounce" outside veer if we did it. But I'm open to more analysis, cause this is interesting