I might be missing the point here, but Sterling's goals do count. Just as Lump-a-poo's goals count, and Kane's etc.
The argument is only relevant if Sterling was a shite finisher who has somehow got new boots and contact lenses. Obviously the twat in the media who said he should practise his finishing like Nappy-rash-ford (when his goals to minutes ratio was around 4 to 1 better) will never understand the real world, but surely some in the media do.
Has Sterling's finishing improved? Yes, of course it has, but part of being a footballer is training and improving technique.
And if Sterling wasn't playing we'd have someone else on the pitch who might have scored all those goals. And possibly more.
How about running a table on where the rags would be without De Gea's saves.