Oh no, what will I do now? Your bluster has rendered me powerless... Nice fail.
You're comparing an unknown kid to a Tailed Beast, one of the most powerful creatures in Narutoverse and an integral part of the story. You're also indirectly saying that one of the only scenes in the Manga, which contains scenes of the So6P talking, is in no way an item of significance.
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Further it is one of the very few instances where Tobi demonstrates nervousness. So even if your not concerned about him not knowing their names, Tobi is.
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Hahahahaha. You don't know the significance of Tobi not knowing the Tailed Beast's names do you? Hahaha I'm not gonna tell you...