[Robert A Cook PE]

Cracks “can occur” or “did occur” ???

Hell, cracks “can occur” anywhere inside a multi-million horsepower turbopump spinning at tens of thousands of rpm in a liquid oxygen atmosphere.

[NorthMountain]

preliminary reports from a Government Accountability Office investigation have found "persistent cracking of vital propulsion-system components,"

I read that as cracks occurring in the real world.

And NASA is the customer for SpaceX, just like they were the customer for STS, Apollo, Gemini, and Mercury. And they damn well BETTER be monitoring contractor performance thoroughly, "fella".