pending results of a no load cranking test (plugs removed), may be worth pulling the flywheel, remove and visually examine the starter clutch components...its springs, rollers, starter gear, chain ...the whole enchilada between starter and crank. If the engine is free to rotate via the flywheel nut (which you've confirmed) very likely your problem is there somewhere.
Prior to reinstalling the LH cc cover you can engage the starter and safely get a quickie visual crank test of those inner workings too. Needless to say, watch fingers, long hair, clothing...beware. A helper, someone to press the start button while you're carefully observing, may be advisable too.
“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson
Custom Carb Service
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Last edited by ducatiman; 1-11-2020 at 9:01 PM.