I have such thumbs, and when I got into CtC stuff, it was a bit unusual to me to realize that there’s such thing as “leading edge picking” and many players (including Troy) employ it. Seems that I always tended to hold pick nearly in parallel with strings… It is kind of difficult to me to pick with leading edge. The bigger the angle the more difficult it feels as I have to keep my thumb in certain position, while for “natural” leading edge pickers it is kept in that position by itself as it can’t be bent any further.