Not to sound mean, but are you stupid?? Kishi put them like that, so you can actually see the comparison between the Madara/Indra Hashi/Ash
If Kishi put them on the same level, you Hashi/Madara would be in front of Ash/Indra and you wouldn't be able to see them as well.
Hashi/Madara are in the foreground and Ash/Indra are in the background
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With your logic, I guess Vegeta is taller than Goku, right?
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Guess all the Kages are taller than Naruto, too.
Those two aren't taller than Hsahi/Madara. You should just comapre that image to this:
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That's all.