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The critical angle was also fairly low as well. There certainly needs to be more research on VBV in the lowest 3 kilometers of the atmosphere. In the one and only study that was done only one example had an inflection point below 3 Kilometers and that one case ended up being the one where supercell development wasn't sustained. However, that's an extremely poor sample sized and I'd love to see at least that study redone with more cases with VBV in the lower atmosphere.
By 6z VBV was gone, but I believe the QLCS was fairly close by that point and due the atmosphere being charged up the squall was able to intensify in southeast Texas and southwest Louisiana. Again VBV may not have been the reason why discrete cells didn't become a problem, and if it was there were likely other reasons in combination(Though like I said I don't think instability was one of them as evident in that Skew-T) but it certainly didn't help to have it so low in the atmosphere.
