YI JIN JING'S BRENNAN TRANSLATION

Sup guys i have read dr yang jwang mind's yi jin jing so you see there the Brennan translation is a part of grand circulation and is considered the internal aspect not the external aspect but the translation considers it external can the senior please explain this? And if in the translation its external than what's internal part? What is more authentic? And is dr yang jwing ming right? Or is Brennan wrong? He has the translations as well And is his xi sui jing authentic as he said the first 2 stages of it are practiced If its different can you share how? And what can be added by me i am thinking of seriously practicing it but have no master And does anyone know the authentic shaolin version? Can you guide me on it😭 please any help is appreciated Thank you