Sorry you feel like you have to "defend" yourself, as my purpose wasn't to attack you but to clear up information. I'm a blunt person, which often doesn't come off as I'd like in written American communication. It's likely one reason why I and the German-American and Australian-American people I know get along so well.
I appreciate your perspective on the pump not doing much work in park at idle (around 5 psi,) and at the OP's 2K - 3K rpm it will be pumping well at around 30 psi.
As for your preference to start a rebuilt transmission in neutral, there's nothing wrong with it since (1) it won't hurt anything and (2) it's your transmission and you may do as you please. I took your recommendation to be more of a universal "it's the right way versus the wrong way," so my apology if I read something else into it. I think you'll find most Mopar factory service manuals assume the overhauled 727/904 will be started in park and don't lay out any special instructions for putting it into service. The 1960's and 1970's factory TF 727/904 manuals I use never mention starting in neutral, although I've seen generic non-make-specific aftermarket instructions (e.g. TCI) specify lifting the wheels off the ground and starting in neutral.