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Completed the videos that will hopefully provide the cause of the stiffness. There are 5 videos.
Crankshaft in the case with no cover.
Crankshaft in case with cover no pistons
1958 Evinrude Fisherman 5.5hp Just Pistons
Pistons connected to crankshaft no cover
Both Covers on pistons in place
The crankshaft seems to me to be true and not bent.
My feeling is that the bushings on the connecting rods are rough and provide a significant amount of resistance to turning the crankshaft. Since I would replace both connecting rods it didn’t make sense to do one at a time. This is difficult for me to assess since I have not this type of testing with an outboard motor on the bench. There is no oil lubricating anything except for the WD-40 in the cylinders.