I am not sure what Lemieux has on Ovechkin in terms of goal-scoring, other than raw numbers and what-ifs.
VsX goals, best 7 years average: Ovechkin 59.5, Lemieux 54.5
VsX goals, best 10 years average: Ovechkin 56.5, Lemieux 49.9
Goals leads over #10 in goals, in %
Ovechkin 63-61-52-52-50-44-43-30-26-15-6
Lemieux 85-47-46-29-28-5-4-0
Goals leads over #5 in goals, in %
Ovechkin 51-43-40-39-38-32-24-19-7-4-0
Lemieux 67-37-35-15-4-4
And I know Lemieux missed a lot of time and was a much, much better playmaker, but you nearly have to imagine a second career for Lemieux in terms of goal-scoring, just as good as the one he had, to put him on the same level as Ovechkin as a goal-scorer.
It is Howe/Hull/Richard territory, and that's the leading group.