That's interesting and true.
But there hadn't been a Flash comic for ten years when Barry Allen first appeared and the characters themselves were not embedded in pop culture as they are now. Also Jay only had just over a decade as the Flash, compared to Barry being the character for three times as long before COIE. Thor has been Thor for half a century.
And even then, jay returned in the now classic JLA/JSA crossover. Nor did Barry steal his powers to replace him in universe.