the distortion could be not from the ubolt tightening
it was what the axle hit first. seem plenty of distorted axle housings stresses there
usually from the concrete 2 seconds before that was just minding it's own business
The housing was fine otherwise Just crushed where and only where the round u bolt left an impression.
We can argue this all day long. I'm going to ALWAYS use what the engineers designed over what anyone else says. AND I will ALWAYS torque to spec not "Oh that feels right"