Oiling pattern on inside of new valve covers.

I noticed something very interesting in the oil splatter pattern of the rockers On my 360. After initial spring start-up. Take a look at the pictures. It seems that one rocker arm on the #4 cylinder was not squirting any oil up! Drivers side valve cover in the front and passenger side in the rear. Is that something to worry about? There was no noticeable value clatter that I could hear on the passenger side. Also who makes good valve cover gaskets that do not leak?
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