I have seen several blowed up Busa tyranny's recently, (including mine) and the cracked cases didn't look anything like that. If the C clip fails the gears can climb on top of each other and it tends to eject the final drive shaft out the upper rear of the tranny... much more catastrophic than what your picture shows.
However, Yes... your fuked. It will be interesting to understand the failure mode which caused this failure.
Good Luck!
DD
