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My scenario & it works for me :D now (thanks to this forum) I'm somewhat of a guru on these motors & they work every time I'm up there.
(full disclosure) I have lots of spare components there for a quick repair if needed
The Crankshaft bearings as you were wondering about should be good if the motor only suffered piston/ring damage.
A teardown prior to purchase any parts would be the way to go as it may not need a Re-bore; its all speculation at this point
IF.. that is the only piston that shows "symptoms" I would remove the carb. / Intake and from that end remove the end-cap of that particular piston/rod.
and see ???
Yes, it can turn over with seized rings & if it spins with the plugs out.....seems to me that you have a weak starter and/or bad wiring/connections/ground