It does look possibly like a side blow; however, Iím also wondering who the heck would strike a blow so hard as to cause this damage. Common sense would dictate that you wouldnít hit something that hard in this location. Hypothetically, if the tech smacked it during disassembly, which is where, presumably, it would have occurred, wouldnít he have noticed it sometime during the job? Iíve had my share of ďOh sh!tĒ moments. I mean things go bad sometimes and have to be fixed; thatís business. If the tech broke it and knew it, he's bound to have known that it wasnít going to last and someone would find it at some point. So Iím wondering if it was perhaps reassembled with an impact wrench, or defective torque wrench, and was way over torqued (a defective torque wrench caused one of my ďOh sh!tĒ moments). At that point the tech may not have realized it. It obviously torqued up. Can the indy say how tight it was?
How do you fix it? The only real solution is a new case. With your oil pressure being low, as others have mentioned, itís a possibility that bits of metal have traveled through the engine and lodged in a passage, or the filter if youíre lucky. Iíd want the rest of the engine (pistons, heads, etc) checked for damage.
Is your indy willing to go to court? To fix and diagnose it to my satisfaction would be a several thousand dollar job. Since your dealer has already attempted to deflect onto the indy Iíd be surprised if he admitted fault.