This is turning into a long exchange about basic wiring.
Don't forget that most of your questions about things like how to wire between a jack and speaker are well documented either in YouTube or online with diagrams...they can be searched easily.
My suggestion about the manual was to help you understand what each connection (Speakon type or 1/4") on the back of the cab was intended to do. It may also have information about how to connect the cab with other speakers - IF the original wiring is restored.
You do you; but if you eliminate some functions of the cab, I suggest that you at least put tape over the non-functional connectors.
I admit that I do have a very strong "thing" about using equipment which has been hacked and no longer performs as it was designed to do. If I modify things, I document the mod and re-label the device so there is no possible confusion about connection or function. I keep things a long time (20-30 years) and I know darn well I won't remember the details of such a conversion/mod a decade later.