Your answer has to depend heavily on how you weigh D and G in your top-10. In theory, if you value positional balance, there should be 4 or 5 forwards.
Is Ovie a top-5 forward of all time? No. Gretzky, Howe, Lemieux, Hull, Beliveau are ahead of him right now. You can make an argument that he’s breathing down Hull’s neck, but Ovie still has some ground left to cover before he retires.
The other forwards in the conversation for a top-10 overall spot are Maurice Richard, Crosby, Morenz, Jagr. If you decide to put one of them in the top-10 overall, then the conversation gets interesting. IMO Ovie belongs firmly in that group, but it’s not clear-cut how they rank against each other. The next few years will be about Ovie (and Crosby!) establishing whether they finish inside that pack, or separate from it. And then, if they separate, whether they belong in a conversation with Beliveau, Hull, and maybe Lemieux under completely ideal circumstances. If they can make it interesting as a modern answer to Beliveau and Hull, then your sense of positional balance becomes very important.
I don’t see Ovie or Crosby touching Gretzky/Howe under any realistic outcome. The bar is too high.