Weighing in on the openside debate, Haskell is right, in that it's the balance of the backrow that matters, but this is usually achieved by having an openside that can cut it with the best. There isn't a 100% blueprint for the perfect openside, they tend to vary, with some being great all rounders, and others a little more specialist in certain areas (usually achieving at least 3 out of jackling, carrying, defence, ball handling). All should have a decent turn of pace for a forward and an excellent reading of the game imo.
I find it quite alarming to hear Eddie Jones talking about not having any more 6.5's in the team, yet hearing all the rumours about Haskell starting at 7! A 6.5 is exactly what Haskell would be, as he misses the mark on quite a few areas I highlighted above. He's a typical 6 imo who maybe boasts a little more pace that some of the slower blidsides out there (Lydiate?). I also don't understand the idea of pinning all hopes on a teenager (Underhill), when there's a potentially excellent option in the squad already (Kvesic). I'm yet to be convinced that Underhill isn't more than a potentially excellent blindside either.