yes, rigoli does run PAR's parts...in fact they have their own special heavier duty (super beefy) rod from PAR as they were bending the standard beefy rods.
I'll have to dig through my old email and see if I still have pics.
I have never seen one of their cranks; however are you just saying the #3 (you called it middle) main journal has a larger oiling hole in the crank? if so, that makes sense and has been kicked around before because of it having to feed #2 & 3 rod journals.
Anyhow, always nice to have some more input.