Is Yang Bohai the most powerful and most perverse Master or is it someone else?
That would be elder Shouzi, the hidden elder of the sect. AKA, the Monkey God. He's the old man that was spying on women bathing in the river.
Yang Bohai is the bald muscle giant who is the second strongest elder in the sect.
Is Hidden Elder Shouzi an alias for Master Roshi? >;3
I wouldn't be surprised if that's where the inspiration for his character came from.
And yet, he teaches us how to finger bang (a Crane Hermit technique!) instead of palm thrust (THE Turtle Hermit technique!), go figure! XD