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Hey there! Good luck today.
I can't answer #1, but I can answer #2 for you.
When the manual talks about "TDC", it's not talking about tdc for a specific side, it's talking about a very specific position. Think of it as "service-mode". And while one cylinder is indeed at TDC (iirc, it's cylinder #2 for this motor?) that's not really important. What matters is that you're placing the motor into a known, unchanging position, so that if, during the course of a given procedure, things move, they can be easily put back where they belong. This is especially crucial for procedures that affect timing. SO: when you lock the motor at TDC, there's a mechanical lock (pin) that keeps the crank from moving, and then there are additional Porsche tools available (though some of us have made our own) which lock each cam in their correct location relative to the crank.
Did I explain that in a way which makes sense to ya? I can't always tell..... haha
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