There’s 5 Capstones on it because one of the requests was to stick that specific amount onto the pyramid. BTW, Capstones aren’t necessary for the annual review.
This just goes to show that you don’t need a perfect triangle to get the 80 points required. What you’re striving for is lots of amenities and decent symmetry. For the latter, as long as the left and right sides of the Center are fairly even, the reviewer will throw lots of points at you.
My results were as follows:
Shape: 10
Amenities: 38
Aesthetics: 40
Obviously, if I didn’t have that vertical part jutting out near the top, I would have scored better on the shape. 😛
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koukoupuffs 
I managed to (barely) get an 80+ with an ugly block of a “pyramid”, but most of the score was on the ratio and amenities. I always scored badly on aesthetics since it was more a building than a pyramid.
Yeah, the game is misleading when it comes to the annual review. >_> The reviewer is always looking for symmetry over an actual triangle form. So just do a block and slap on a bunch of Capstones and watch your score skyrocket. ^^;