Lulo Kimberlites Review, page-7

"Well, had they concentrated their search for an economic pipe at Lulo, based on heavy mineral (grass roots) sampling, the discovery of L164 would have been made years ago. That said, it is unlikely (but not impossible) that Lulo's holy grail will come form the Pyrope Zone, since, IMO, it's too far upstream from mb6 & 8. The other very important factor is that we now have our very own KBSP, which, as we know, is operating 24/7."

To debunk the closeness to MB6 theory the same release says they didn't directly contribute to the diamond content of the alluvial but did contribute to the Calonda formation

Then also I'll add the top layer which one could presume potentially have been sampled at 165 is the low grade crater lake covering the high grade pipe