J,
First of all, sorry to hear about your incident. Glad that no-one got hurt. I know that you run your car lowered, taking advantage of our shortened bodies. Unfortunately, every shock runs out of travel given a big enough hit (like a 6x6).
This is an interesting thread because it is the first time I have ever seen an actual shock tower failure. It will only ever be speculation about whether this same failure would have occurred without coilovers being on the car. My personal feeling is the same as several of the other vendors on this thread in that probably the same thing would have occurred even with stock shocks.
The limiter of the suspension travel in all of the C5 and C6 Corvettes is the shock absorber . Clearly the impact of the wheel with whatever J hit caused an extreme wheel movement. The stock shock would have bottomed out and then likely pushed up through the frame.
Like the others on this thread, I am interested to see more pictures of the damage. Then we can resume our armchair engineering
J, let me know what we can do to help.
-Aaron