I saw this solution on yesterday evenings HRRR run which seemed to show a phasing of the initial line which was replaced by a separate line out ahead of the initial main QLCS... I don't know if that was due to enhanced confluence or not, I see that on occasion but it's definitely happening.
another thing, looking at the Hodo and the cross over winds, it just seems like todays tornadic producing cells were , well, radar "ugly". I'm guessing both the 1-3km SVC wasn't lined up well next to the 4-6KM winds on top of it? (in terms of photogenic and radar presentation)
Next Day Edit
I just saw Jeff Duda's post above... yup, what he said! lol.