There isn't any bones in that ballistic gelatine!
I challenge you to find me one person who we could call an expert, or one police force, swat team, tactical unit, defensive specialist, whatever to back up your idea that birdshot is capable of immediately incapacitating an intruder.
I don't argue that it won't hurt, but they would still have the capacity to continue attacking you!
I will admit I actually used to argue the same thing as you are when I first started thinking about home defence, and participating in some similar discussions here. The difference is I know how to admit that I am wrong, and after reading alot of accounts, and expert opinions I discovered I was indeed wrong!
Regardless you seem to not want to reason, and only abide by your personal opinion so this is a pointless discussion.
To the OP sorry for the derail!