You must learn about voting power:
https://steemit.com/steem/@tuck-fheman/how-is-voting-power-determined-in-steem
You can see your voting power below on steemd.
Is kinda distributed like you said but in other fashion. With something called V-shares and R-shares i but this is bit technical and oudated too, but can help you a bit.
https://steemit.com/theoretical/@theoretical/the-steem-reward-system-part-1-v-shares
In post above i try to explain what happens with ecosystem when poweringdown of powerhouse is going on.
Here are some nice stats about anyone you can change @ part withsomeone elses name
https://steemd.com/@leksimus
And mandatory for understanding how thing here wotk is by reading whitepaper explanations its lenghty and technical but has some graphis explanation to understand how it all works.
https://steemit.com/steem/@liondani/steem-whitepaper-download