Wouldn't Chidori be harder to create through Susanoo's Tenketso? Enton is inherited from Sasuke's power, so the Chakra manipulation might require less than Chidor or its variation?
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Unlikely to be the case. Sasuke can expel pure Enton with his Susano here [
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]. He didn't use his Amateratsu, yet was capable of manifesting Enton. More so, Chakra control is no problem, as Sasuke has shown to manifest massive amounts of Chidori through his based body prior to ever even receiving the MS [
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]. The fact that Chidori Nagashi only requires and expulsion of Raiton chakra rather than an actual control over it also implies he can do it with Susano, as chakra control is a non factor in a randomly moving current [
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]. Not to mention, that stabilising something as large as a Susano and creating
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is more than enough of a chakra control feat to justify him being able to use a Chidori through any Susano variant. Also, all his non-Enton arrows are created with chakra control [
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] as it is separate from his own Susano.