Scary steering shaft/coupler failure!

I would first look at the column mounting under the dash. If those slotted blocks and bolts are properly positioned, about centered, the sheer pins in the shaft are likely broken.
Although I haven't studied the engineering, I'm not sure there is enough travel in the under dash assembly to let the coupling come completely apart.
I don't believe the tiny roll pin is a safety devise either. Its purpose in life is only to protect the bottle crimped cap, prevent the coupling accidently coming apart during column handling, vehicle assembly.
A pretty good hit will blow right through that little pin ( been there done that by accident, coupling hung on firewall opening as column was pulled into the cab ) but it is better than nothing.