For 1080i analog pass thru is the RGB the only input that will pass thru 1080i. I have tried component from my STB sending 1080i and it seems to only allow the resolution choices and no pure pass thru.
720p and 1080i component both seem to work fine in my HDL (outoputting to a plasma).
And in answer to your original question, only the rgbhv input has HD pass-through (which makes sense since the HDL has no component out so component in must be processed to some extent to be able to output via rgbhv or dvi).
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