Reviewing your old work to keep canonical consistency is something every writer has to do. That's what makes a good writer.
A bad writer, however, reviews their old work and still spits on the canon by changing it.
Lastly, none of the current Espada are VL (unless the top three are or one of them is) because that would defeat the threat of the Espada completely if they were and they all ended up dying.
Also, Grimmjow was stated to be an Adjuchas-class menos (as were most, including Nel and Nnoitora... after all, if they weren't, why would they be looking for them).
Another thing, for those stating that Barragan can't be a VL - remember that VLs only have a human-sized appearance... not a humanoid appearance. The more like a human they are when they release, the stronger they probably are. Just because Barragan has a skull for a face doesn't make him an Adjuchas - remember that Ichigo's inner hollow is easily VL level and he has a skull for a face.
Just wait until Kubo's next make-believe chapter. He'll explain it eventually. Hopefully I haven't given up on reading the series by then. I'm holding out for the conclusion to the captain fights.
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