That is about right. The backlog is what makes money in general.

You want the top 5% not working on the backlog because that means if something urgent comes up you don't feel bad about asking them to switch tasks. If a junior needs help they are not interupting anything imbortant to ask. and it means you are making the 5-10% your leads and thus growing them into future top 5%.

that the top 5% often discover things that make money you didn't expect is a bonus.