Rockers doing their thing, but not passing oil

In this video I took off the valve cover so I could see if the valves were doing their thing... I previously did a compression test and found that #6 cylinder had very little compression - 46psi, when the other 7 cylinders had between 120 and 125 psi. Along with the ticking/clattering of the engine, this told me that there was a bent valve or a valve stuck open. So I took the valve cover off and started the engine. They were all opening and closing and not ticking from loose rockers, therefore the clattering had to be deeper in the engine. Also, I noted that there was very little oil coming through some of the push rods - especially #6 and #4 cylinders - which appears nearly dry. While #8 and #2 cylinders has the appropriate rate of flow.