Going by what you have described up to this point.
I might try barring the engine over by hand at least 2 rotations to feel if there is any internal interference.
Yes, visual inspection of the cylinders would be a much option.
As far as have the throttle body butterfly open during a compression test.
Lets put it this way …
How easy could you breath if someone was pressing a pillow over your mouth and nose …
Yes you can but at a extremely limited amount.
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