HA vs Nexus, some Nexuses have higher stats?

[Bixby]

Neither should be blatantly weaker or stronger than the other, but in specific instances the Nexus trumps the High Allagan, where this isn't the case everywhere. Those're discrepancies, and I'm curious whether these are by design, or whether they are an oversight.

I'd say it's probably somewhere in between, but leaning more toward oversight. My guess would be that they spent just enough time to make sure things aren't horribly off-balance between the two, and they're comfortable leaving it where it is for a few patches.

It's obviously not a huge priority for them to make sure Allagan/High Allagan/whatever top tier raid gear in general is absolutely, unquestionably the best, or BiS lists wouldn't include a mix of gear from other content.