Most likely Tencent wants to seperate the two kabutos so they can add more ninjas to the game. Snake cloak was known for summoning and sage mode was shown with using the sage mode with the sound four, karin, kimimaro, jigo, and suigetsu abilities. Not sure what the skills would be in-game but most likely a mix of those ninjas. Not that familar with the ninja storm series but that might figure out what his skills could be if they separated kabuto for the versions.

It was kind of hard to give the swordsmen notoriety in the canon series before the war since #1 majority of them were dead and #2 the focus was on the hidden leaf's problems rather than solely on other villages without the leaf's being involved.