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That is unfortunate as you took full responsibility for diagnosing the issue.

If I ever taught a "customer 101" course the very first thing I would say is never tell the mechanic what the problem is unless you are willing to take the consequences, the only thing the customer should do is describe the symptoms and let the mechanic do the diagnostics.

It can't

He is correct that the normal failure of a head gasket generally has coolant getting into the oil or both, but combustion gasses can get into the coolant from a head gasket failure, I don't think it could contaminate the coolant as much as you describe without being obvious, did you ever look...

Does he see what he thinks is a crack? if so where?

Maybe someone else has had this experience, all I can suggest is have him inspect the cylinders very carefully, have the heads magnifluxed for cracks and have the head gasket surfaces checked to see if they are true, if nothing is found then have him reassemble it and see, not all head gasket...

The GM 6.5 was bad about having cracked cylinder walls, it is said the tooling that machined the piston coolers nicked the bottom of the cylinders of blocks that had a significant core shift, (this would lead to a crack in that cylinder wall) many were the #8 cylinder, so it could be diesel...