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To also answer your earlier question, yes I too understand all sups should forward traffic on their links. However, unsure whether 2nd sup (with chassis in VSS config) actually also forwards packets. (I.e. it might be just a warm standby, like dual sup720s in a chassis.)
Also yes, you can place 6 (or as Leo notes 8) links into a Etherchannel. However, why would you need that much bandwidth, perhaps in case a whole line card fails? (An ideal VSS shouldn't normally be using its VSL as all other device connections should be dual homed to the chassis pair.)
