Nope, Kurama is the problem,...
Yes, he could summon them. I'm sure he knew a lot about sage mode...but unlike Naruto and Sasuke he relies on his own power. Its only something he uses when he needs to. He'd die before he summon them and or use sage mode...already have so he used it anyways. Minato is boss.
It isn't that he insists on relying on his own power, he just sucks at Sage Mode. Besides the point anyway, because Sage Mode is still your own power, just greatly enhanced.
It isn't that he insists on relying on his own power, he just sucks at Sage Mode. Besides the point anyway, because Sage Mode is still your own power, just greatly enhanced.