Nope. I did not miss it. Outside of esoteric mathematics clubs, there is no reasonable English interpretation of "if you are average" that is about mathematical probabilities, (especially where those probabilities are unstated*). I am perfectly happy to accept your assertion that you chose your words badly, if you decide to assert so. I'm never going to sit back for an attempt to make me appear wrong by redefining what they said earlier into terms that were unstated (and not even implied) when I read it.
* If I said "Your sister is an average sex partner" (which I wouldn't because she might not take it well) that can't be taken as meaning anything about her being average for people who enjoy fellatio (Which is part of sex, no?) on a daily basis . The only thing it can mean is that she falls close to the typical sexual partner (unmodified by my definition of what typical ought to be). By the same token, referring to "if you are average" in the context of people who are playing a game, you can't pretend that means anything other than if you are close to being a typical player of the game. There is simply no reasonable way of asserting that those words mean "average for people who play the game the way I think it should be played."
Edit: and to get back to the only thing I actually mentioned which makes you atypical in this. Even players who participate in fighting every single tourney, do not, on average, have a blueprint to devote to crafting into RR spells once a week.