thats what makes him #2
jubbito #1
if you really think about it madara let obito gain jinchurkin
Eh, I think Madara had maybe planned for something like this, but never really thought it would happen... kind of like how Nagato used his Rinnei Tensei. Madara had planned for it, but was not happy at all about it and never expected it would happen/be used for someone/something other than reviving himself.
As for Madara letting Obito gain Jinchuuriki, I'd have to disagree with that. Yes he was protecting him while they (Hashi and the other Hokages, Naruto, Sasuke, etc...) tried to get to Obito, but I don't think even Madara planned on Minato FTG`ing Obito's butt and allowing him to move/be free of Madara's control.