I think what they mean is scale = repeatability; you can't really say "clone rockstars" but you can do something n-times with a pool of good developers, and leverage = the scaling action; ex: a senior dev could increase their output by 10% or you could introduce some knowledge sharing/mentorship/coaching program where the individual's capacity falls by 10% but they increase an entire team's production by 5%. In a small org where you probably shouldn't have dedicated dev. managers stick with the former; in growing companies the isolated rockstar is still rare and you're trying to move the needle with 50, 100, or more software devs.