That mangled connecting rod tells me that the big end of the rod lost its Babbit and seized up on the crankshaft. The weight of the vehicle and inertia did the rest. I've seen insert bearings wear loose and overlap, and wedge the rod tight against the crank, but in this case, it's likely that the Babbit lining came unglued from the rod, wadded up, and wedged itself. Just a guess, but I've been building engines for a little over 65 years.
Jerry

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"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!