So, why should the person screening the candidates suggest the strongest candidates?
This is why I tend to suggest equal seniority individuals should not screen candidates. It's a subconscious thing ("He's too aggressive" "She seems like not a good culture fit" "He is too senior for this role") that most people don't think of directly, but happens.
A stock compensation helps in that regard: hiring strong individuals will help ship a better product faster and should increase the stock value. Meanwhile traditional stack-ranking and a mostly salary compensation will encourage individuals to make sure they are seen as the top performer no matter what.
But in that situation, I can give top performers more equity, but in the grand scheme of things, thats not much incremental total dilution to the average employee. We all still make more the same way - when the company makes money or is sold.
If you are at a larger company that is a going concern for a long time... it gets a bit harder and takes some more thinking.