HI Marcus!
I am trying to understand your post.
Could you clarify, please:

"Whatever it may be, there are higher instances of both existing in one individual."

As for being similar and getting tacked together, many people have this thought. I have found pdocs who truly know the difference, do not have any reason to tack BP and a PD together. Every pdoc I have ever talked with about this, says the difference is very clear. (That said, there are instances where pdocs disagree on the dx of the same patient. )

I, personally, think it is the armchair pdocs, like us, who tend to muck it up amongst ourselves, more than it is mucked up for the experienced pdocs.

It is good to have you posting again!
I hope to see you around more.