Jack, awesome pics but stop being such a pansy, it's only a piece of metal going through your hand.
Just kidding! Hope you're doing better.
As for the t-case, I thought the people with failures said it was something to do with a worm mechanism. Overall, I agree that all those pieces seem to look pretty heavy duty.
Your work on this is fantastic. Maybe you can relate some t-case failures that you've seen with other platforms and see how those weak points relate to the specific xi parts.