Board Thread:Naruto Discussions/@comment-30323490-20180418150329/@comment-27924662-20180419023004

hold on are you sure its just size of the summonee is the only thing which matters here? There has to be some other criteria to it too. After all Just to summon Madara, Muu had to knead quite the amount of chakra in fourth Great Ninja War. So much that it atleast take him minutes before actual summoning occurs.