The manga is drawn in so many different fashions to put emphasis on different things. Trying to scale those meteors that were drawn in so many different sizes to put emphasis on Susanoo, Narutos attack, the curvature of the earth, the mountains in the BG, the shinobi alliance etc etc will be impossible. Scaling manga pages will almost always be wrong besides obvious ones (like Naruto being taller than Sasuke) so we have to wait until the anime releases the episode so we can see exactly how large they are.You must be registered for see images
we can see here that the CT were the same size as the roots of the god treee,
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and we can also see that Sasukes PS is not even visible infront of the meteors
here we can also see that some meteors are larger than the others, being even larger than the root of the god tree,
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hell even nagatos CT dwarves mountains, as shown below
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now compare madaras PS to mountains
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and sasukes PS to the meteors
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just goes to show how large the meteors really are
people seriously need to realise how large the meteors really were,
not to mention that a CT is alot more durable then a mere rock of the same size,
therefore emphasising the power of rikudo PS even more,
had madara been in that scenario, he wouldnt have survived at all