10x definitely has nothing to do with salary in either direction - you can't conflate productivity with salary and expect to make sense of the world we operate in.
just bump your 10x engineers in grade and salary and suddenly nobody will think of them as 10x engineers. They will be just typical specialists at their place and their level.
or there could be another possibility: You think you have 10x engineer on your team, but actually you don't have them. You just keep employing a lot of 0.1x engineers that are unfit for their position/level/grade
I think the latter view is why companies like amazon/netflix fire a lot of engineers that they think are 0.1x or less than 1x
