...you can vary where you pull the bar too...
I think this is just an issue of resistance. Increase the weight so far, and you wont hav much of a choice in where you pull the bar to.
If you are strong enough at pulldowns/ pullups, you will be able to control where you pull yourself to in a pullup.
I consider myself quite strong at pullups and so can touch the bar with my chin or, if i want, near my naval.
(Pretty piss-poor job of explaining that but sure...)
Goudy's very humble. Very strong on chins. Done an easy rep with 40kg added just the other day. Probably capable of a set of 18-20 to failure, though that's not his thing so we may never know.