there's no need to prove it was common, only that it existed in greater proportion then than it did post 1980[/b][/size][/color]
And neither have you proved that it existed in greater proportion in the past. You have stated that you believe it to be true, but this is different from it actually being true.
Secondly, definitions of terms are vital. The "I know it when I see it" doesn't necessarily hold (and it only does so it's legal context because it has become such a catch-phrase), because it allows you the undue privilege of telling others that their examples of "quirk" are not "quirk," which you have already done with Paul Cowley. Honestly, a contemporary practicing professional tells you that "quirk"' still occurs in golf course design, yet you tell him he is somehow incorrect? How does that help the conversation?
I (as well as the Merriam-Webster Dictionary) define "quirk" as: a) an abrupt twist or curve; b) a peculiar trait, idiosyncracy; c) accident, vagary. On a golf course, then, quirk is those features or elements that are unexpected. The routing that Paul Cowley describes fits this definition, because it goes against what many people might expect or find to be a standard. Conversely, the geometric architecture that you are using as representative of quirk is potentially only that way in the modern sense. It was much more prevalent in early designs, which means that early golfers would not have found it to be so idiosyncratic, and therefore not as quirky. What is quirk today may not have been so back then. Today's quirk simply takes a different physical form.
To answer your final question, yes, I believe that quirk in modern golf course design is equally as common today, in part because of what I have just explained, and in part because it is an extreme disservice to modern designers for you (or anyone else) to declare that they are not incorporating idiosyncracy into their work, or that quirk was an element of design utilized by only by the greats of the design canon, but somehow physically and/or intellectually inaccessible to the guys practicing today.