You're making the assumption there is no damage to the bearings. That's a tenuous assumption to make on an someone else's engine. We don't know the entire story, including justI think yelling at the guy through the keyboard is unproductive. Making some big assumptions without any evidence doesn't help either.
how long it was run without oil. Wasted turbo bearings won't put that much glitter in the oil. It's a darn good bet much of it is from the engine bearings.
Unless he is willing to drop the pan and remove rod caps, nobody knows the facts. However, assuming the engine bearings are 'probably fine' is the wrong
way to err. And suggesting he rod the piss out of it up a steep hill is just plain stupid. You can do what you want to your engine, but it's incredibly irresponsible
to suggest such a course of action to others