Board Thread:Naruto Discussions/@comment-30323490-20180418150329/@comment-734582-20180418175157

Vladosaurus wrote: When i mentioned Kamui i was referring only to Kamui dimension, which Obito could easily go to at any given time. Obito can easily go to the Kamui dimension because it's his own pocket dimension, and so carries it with him. He still had to expend massive amounts of chakra to actually connect dimensions.

We don't know anything about Sasuke's hawk, including where it actually came from and where it resides. We do know however that Sasuke must have considerable reserves. So even if the cost of summoning were higher due to the distance, it's not inconceivable that he could simply pay that cost. Minato, Jiraiya and Naruto summoned giant toads with ease, and Sasuke summoned a giant snake with ease. This despite the fact that Base Naruto could only just about summon a small frog from his own chakra and could only summon Gamabunta when he tapped into Kurama's chakra. Chakra costs of summoning thus scales with volume, and summoning such giant animals easily means all mentioned people must have considerable reserves.

This means that Sasuke summoning a much smaller hawk at much greater distances, could very well cancel out the issues and so make it like summoning a giant snake in the main dimension. Given that he summoned the giant snake in his EMS form and his Rinnegan has much more powerful chakra, and he got a ton of chakra from Hagoromo too, it's likely that the level of jutsu that are easy for sasuke has increased considerably too. It doesn't automatically mean summoning that hawk is cheap.