Board Thread:Naruto Discussions/@comment-30323490-20180418150329/@comment-30323490-20180418190155

That's the thing. I doubt that distance has anything to do with summoning. I may be wrong, but i can only recall the fact that for larger summons you have to put in more chakra. I don't remember ever being mentioned that distance influences the amount of chakra you need to put in.

And Hagormo had to summon not only team 7, but 9 Bijuu + Madara as well.Team 7 were meaningless compared with the Bijuu. Hagoromo was also a spirit, and not even close to his full power. Hence why he needed the other Kage spirits to aid him in the process.