No clue why you are choosing to go with an image that is comparing a xoomed in meteorite to mountains far away.. of course the meteorite is oging to look big. Compare it to something it was right next to :
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Furthermore, Kurama is hardly the size of Buddha's main hands (which are smaller than the ones on the back:
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You used the far away image of buddha and kurama, that showed Kurama being drastically bigger than the hands, because of the poor drawing in the scans.. yet the close up of it clearly shows the huge difference between the sizes.
Look at the image you showed of Onoki trying to stop the meteorite, you can see the meteor's oval being shown a small bit on the side.. and you can still visibly see the 3ft Onoki. Yet in Sakura's explosion, Juubi clones about 5 times the size of onoki, look like ants. If you think the meteorite is going to survive 2/3 punches like that.. then you need to recheck the images.
If you wanna prove me wrong, feel free to. But you won't be able to without sounding like someone who doesn't know how to read or look at images.