Papa legba is the crossroads, personified.Papa Legba is the first spirit called in all houses of Vodou across the board. He is definately the most quickest probably to help, he is never too busy as you claim. He did a favor for God and he got more ashe or energy than the other lwa. This is why he is important and called FIRST. He can mutiply because of this gift from God.
Attibon Legba is a certain "path" or "aspect" of Papa Legba. But not Papa Legba himself.
Offerings are more like Rum, not Vodka. I am pretty sure they do not have that in Haiti to begin with.
Legba-nan-Petro, is Kalfou and he and Legba are associated with crossroads. The different sides of a coin but the same crossroads.
For the Guede, black and purple are their colors. Not black and red.
Papa legba does not recieve offerings of djakout nor does he carry one this website proves my statement. It belongs to Kouzen Azaka, the farmer.
http://www.kiwimojo.com/kouzenazaka.htm (this link tells you about"Djakout" and Azaka)
"Adjessi" or whatever you made up is not coming up in a google search, I never known papa legba to have a wife. Reason why you said "obscure" because she never existed....
There is so many mistakes in this article it is too time consuming to point them all out, Kenaz Filan has some great books. I would buy them from online like Amazon.