Nice pictures, they show what happens when you overdrive/overpower a sub well beyond its design excursion limits. I assume you had a gp3000d on each sub. We must have very good coils and cooling as the coil looks in very good condition. The glue joint didn't fail either, you overdrove /unloaded the sub one too many times and ripped the spiders into. The HDC series is almost impossible to bottom out, you will rip the spiders into before you do that. There are two layers of spiders in the HDC3 suspension package with each upper and lower layer having 4 spiders for a total of 8 spiders. You have to do some serious over excursion to rip them.
You are correct in that I don't warranty ripped spiders or burnt voice coils and I don't know of anyone else that does either. For guys that compete and push well past the design limits of the equipment I offer drop-in recone kits for all our subs at very reasonable prices, under $60 for the HDC315.