I was so pleased to tell Lee Hambro my discovery that you should play the first note after a relatively long note just a touch softer. Otherwise it makes a “bump” that disturbs the line.
It was the kind of thing I knew Lee would relish; and he did. But he added that he’d been the one to discover it, and I must have learned it from him.
We never did figure out the priority; luckily, it doesn’t matter. This subtlety helps players at all levels. I always mention Leonid when I teach it, and think of him when I use it—which is all the time.
A “relatively long note” might be a dotted quarter appearing in a string of 8ths, a half-note in a string of quarters— or for that matter an 8th in a string of 16ths. And mind you, “a touch softer” applies only to the very first note after the relatively long one! 
