to me JGills made perfect sense.....what do you mean he used a 'portfolio term'? (an academic term maybe?)
If your comment was "how do both make money" from sle then you basically answered yourself before you asked the question...(or was it not really a question?)......JGills confirmed his version, and I did much the same....and added the story of a fund manager asking a similar question many years ago.....these were real trades, not theoretical ones.

I think a lot gets lost in terminology when we are all speaking Chinese but hearing Spanish.
From my own experiences of equity option market making 1992-2004 and purely directional trading 1998-present, most trading skill is in waiting and doing little while most market making skill is in collecting an edge and managing extremes but also doing as many trades with edge as possible. (these days its probably changed with HFT). There is still skill in market making. There are still plenty of ways to give up the edge or think the model is never wrong.
But its pretty much as simple as that.
The truth - luv that term - is what ever works in reality, and if its discounted then its probably because its a diamond in the rough, as the best things in life are free!
I guess for me it boils down to dealing with how things work in reality, and not worrying too much about the theory v the reality, BUT still understanding the risks - you probably shouldn't just sweep those under the rug.
....and yes its all interesting for discussion.