Where are the Maxxis is perfect brigade beating their drums? They are curiously absent here.
This damage does not look like the normal heat of an AZ summer. This looks more like a Fault at manufacturing. To me it appears that maybe the rubber compound was not at the right temp (too cold) when injected into the mold.
with all due respect to the op: throwing away 6 perfectly good tires just to buy 6 new ones is economic insanity, wasteful, environmentally irresponsible and a total waste of time.
But they are his tires.