....wait are you claiming that a person needs the sharingan in order to eyeball something? Does a person need the sharingan to determine that gamabunta is about as big as gamaken and gamahiro or a tailed beast? Goodness gracious.
HEre's what you do.
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you use your eyes to look at the meteors and you use your eyes to look at the crater beneath the shinjuu and then compare the two. Is one significantly larger than the other? If the answer is no, then they are comparable and that gives you an idea of how big each meteor is compared to madara's PS and the damage that his PS can do.
No sharingan is required, just a functioning brain, at least one normal eye, a teaspoon of objectivity and a dash of honesty. I'm assuming you have a functioning brain and at least a normal eye, so you either need to stop being dishonest or start evaluating posts with objectivity.