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No, what he's saying is that the M57 has two sets of intake ports -- one set runs through the side of the head (like any traditional engine) and the other set runs through the top, meaning they pass through the valve cover. The valve cover gasket therefore not only has a perimeter seal, but six inner ones to seal off the intake ports to prevent boost from entering the crankcase.
It's possible that your perimeter gasket is solid but have a compromised inner gasket. I don't actually think that's your problem because when that happens oil will force it's way out everywhere and you won't have any trouble spotting the oil mess.
More concerning to me is the reported low compression on cylinders 4,5,6. Can you post the pressure readings you got across all six? Any folks with engine building experience here who come across this thread will likely want to know everything what's going on there.
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BRR Tuned
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