What criteria is number 1 selected based on? We know that the end result is 1 to 10. But how does number 1 know that the end result is supposed to be 1 to 10?
Number 1 doesn’t know. It is selected for its own beneficial impact on the organism as are all the rest. In the example, perhaps #1 allowed the fin to better support the fish as it lay on the bottom of the shallow sea.
Sounds like you need an Intelligent Chooser” and selector and picker and sorter to pick out each block (1, 2, 3, 4, 5, ...) in the right order though.
Remember, evolution works. By trillions to the trillionth power of get-each-random-mutation-in-the-right-order-AND-get-each-random mutation-be-the-right “random” event.
An “eye” has no survival benefits (and will burden its possessor!) UNTIL the optic nerve, the lens fluid, the brain, the brain connections and processes, the muscles, the lens muscles, the coordination between optic nerve-brain-muscle all “work”.