[VTSummit]

I read the whole OP- not all the responses.
SEMA will go to bat for you- call them now.
The dealers are commonly asked to take pics of the engines of performance cars when there is a catastrophic failure.
If they stopped work before finding the failure, that needs to be determined even if it means paying a dealer to tear it down more until the failure point is known- otherwise it's speculation what failed and why.
Manufacturer of the catch can should be notified- not their problem, but they can provide info when/if it goes to court.
OP has been misinformed and I think his dealer has not really done anything to solve the issue. I've had to bring in area tech reps to look at vehicles where there is a question as to what happened and I risked losing the money on the tear-down... but in the end never lost the time and always won my case.
I wouldn't do SQUAT until I knew WHAT failed. Have a certified mechanic get to that oil pump and see if it failed in the same manner so many others have. THEN they would have to prove how the modification caused this specific failure... Remember this over all else- if you don't know EXACTLY WHAT failed... you got nothing.
/end rant retired fixed ops director for GM