I'll bounce this off of a few DPE's and get their take.
Well, I and also with Mark on this.
Greg, you're not really agreeing with me (as opposed to the FAA). And you never know, he just might find a DPE who is willing to go against the Chief Counsel's official interpretation

Your second question concerns how the pilot performing the duties of PIC with an authorized instructor may log flight time. Because this flight time is a substitute for solo flight time, the pilot is not receiving instruction and therefore cannot log this time as dual instruction received.
It's your bias. We all have them.Not seeing a clear distinction that all 10 hours need to be either / or, but that specifically might be my bias.
2016 Grannis Letter
I wish I was important or smart enough to make this stuff up.
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