Moderator Error!!!:
Crap... I (Mitchell) accidentally editted this post instead of creating a response. Gonna see if Jeff can restore it. Sorry!
No worries Mitch
This post was just explaining that the wilms leech + gardikis double jump can only be pulled off together on the 5th girder due to long ladder placement. The Gardikis double jump or better known as the 6th girder double jump can be pulled off on any of the girders provided it is done on the the last 3 red block/ segments of a girder (and maybe mid girder on the 1st? I could have sworn I seen Ethan Daniels pull it off).
This picture demonstrates the areas where each move can be pulled off, at least as far as I am aware.
EDIT: Jry just cleared something up in the shoebox, The 1st girder leech I saw ED do was a wild double leech, not a Gardikis jump as apparently thats only possible on the ends of girders due to a decrease in barrel speed before the barrel rolls off the girder and therefore keepining it within range. So disregard that green box on the first girder, lets all just blame Barra and move on