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That is not grease you are likely looking at, but rather old sludge. If you smear some out on a newspaper, it will likely feel gritty, and there will be no color traces of untouched clean grease. Distributor should rotate both directions to allow for compensation of production differences in distributor caps, fuel quality, etc. Distributor might be stuck due to dirt, corrosion and sludge it should come out if handled carefully. It would be a good idea to strip the distributor down too to at least clean the grooves on the shaft. If bushings are worn, those should be replaced too, and there should be some smooth "up and down" movement of the shaft- This helps bring oil upwards to the upper bushing. There ought to be a way to also add some oil externally, such as an oiling cup. Otherwise the oiling happens from oil thrown off of the valve train hitting the distributor shaft. Also poke around the area covered by the piece you removed and see if there are any oil returns or venting holes that have been clogged by the sludge.
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