Knowledgeable fans should know for normal humans, using chakra outside of the body is difficult and challenging. This is something usually doable by Jonin level ninja. However for those with the Kekkei Genkai to manipulate chakra much more flexibly be it inside or outside ninjutsu should be much easier to use.
I think this is the case for Boruto. Sasuke credited Boruto's Vanishing Rasengan to him subconsciously applying Wind Nature chakra to it. However I think its mainly because of his Hyuuga KKG to release chakra from his tenketsu. Its basically the Air Palm + Rasengan.
I feel like Boruto would do ninjutsu that could even surpass Sasuke's. Simply because Sasuke wouldn't have the KKG to do it.
I think this is the case for Boruto. Sasuke credited Boruto's Vanishing Rasengan to him subconsciously applying Wind Nature chakra to it. However I think its mainly because of his Hyuuga KKG to release chakra from his tenketsu. Its basically the Air Palm + Rasengan.
I feel like Boruto would do ninjutsu that could even surpass Sasuke's. Simply because Sasuke wouldn't have the KKG to do it.