Check with the dealer or tire manufacturer to see if it should have been covered under a warranty. The cheapest tires I've seen usually has a 45K mile warranty and it goes longer on more expensive tires.
Never owned a Pilot, but the kind of wear you're seeing sounds really odd. Id talk to the tire manufacturer.
If the vehicle sat for a long period of time, yes ties will rot. And if you have tire rot, they are vunerable to blow out.
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