Board Thread:Theories and Speculation/@comment-34997073-20200622051431/@comment-34997073-20200622082933

which is why i said "have or ORIGIN of" as the sharingan and mangekyo are likely the human equivalent of the tomoe of certain rinnegan. as for tenseigan it is a power that made manifest in otsutsuki even if not entirely pure(hamura was essentially half otsutsuki) rinnegan is also a power of the otsutsuki but doesnt mean human hybrid cannot manifest it themselves under specific circumstances. not to mention the jogan which so far has only been seen in boruto(a human with almost no otsutsuki dna) using an eye which momoshiki described as a "strongly inherited" power of the otsusuki clan.

with isshiki it may not be stated yet what his new eye is called or is capable of but the end the chapter clearly shows he can utilize the power with said eye and was likely the source of the power to begin with(isshiki was inside of jigens body after all so it is very possible for him to access his powers)