Obito and Sasuke both only have yin hiden in their databook but both of them have yin and yang in naruto wiki.Obito had Hashirama cells in half of his body but he didn't have Yang.
Edit: I guess the naruto wiki is going based on the yin yang page of the fourth databook. If you read that, you would understand why Sasuke and Obito have yin yang release. Don't get yin yang release the kekkai genkai confused with yin element and yang element the hiden. Hiden is an element each element someone is skilled in by clan and talent.
It's common to see Nara clan all with yin element hiden because they're clan specializes in it in comparison to Chouji's clan specializing in yang element hiden.
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