Are you stalking me? xd
Unless you're Autistic, then you should be able to not to look at things literally, the guy above posted the manga page.
I'll explain as simply as I can, Danzo said "that's nothing compared to Itachi's Tsukuyomi", the first two words are said in an emphasised tone, telling you that he's referring to Tsukuyomi, the he goes on to say "which could alter the length of the illusion", this subordinate clause is making a comparison, when you put the main and subordinate clause together, you end up with a single comparative, meaning that one thing is being compared, one jutsu.
It wouldn't apply to one person and doesn't, why should it? Kishimoto isn't just going to change the basis of a whole idea, or specify something that general for one person.
He casts Amaterasu from his left eye, and Tsukuyomi from the right.
Example:
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He has his
right eye open,
specifically has his MS active; which I will note he didn't for the whole fight.