I was not the biggest fan of Ellen White, as she could go missing sometimes in games, but even when she was quiet you knew that she could pop up with a finish. Kind of like Kane really. We've definitely struggled to replace her.
For me at least she doesn't hold up play enough, doesn't press enough, and doesn't get in the right areas enough.
We've been knocking it long to her, but many times she can't control it and it bobbles off her to an opponent.
I.e not a good target man, not mobile enough to be a good poacher.