And Robshaw doesn't? If you think he doesn't, we'll have to disagree.
How can a man be a natural 8 if he's played most of his life elsewhere? By possessing all the natural attributes? By showing a natural aptitude when played there?
Robshaw's form has not dropped by being played at 7 or 8. He possesses the hands to play both positions, the brains to play both positions, the engine to play 7 and the carrying to play 8. There is no reason he can't switch to 7 the same way Wood has, or switch to 8 the way Read has. He has the ability to carry out those tasks. He is a complete player - and because he is such a complete player, he has the ability to fill all of the positions. He has done this up to International A level (played & for the Saxons this spring), why not try it at the top table? It would potentially allow us to pick our three best back-rows as a complimentary unit that covers just about base.
Incidentally, depending on how serious Easter's ankle injury is (not very admittedly from the last I've heard), Robshaw might will emerge as the outstanding English candidate for 8 come 6N time anyway. We're very thin on the ground there, there's quite a few long term injuries amongst those who might have made it, Narraway's not getting picked regularly for some reason, Morgan thinks he's a taff...
Anyway, disagree if you will - but if a man's got the talent to play more than one position, there's no harm in moving him around, and what I've seen of Robshaw says he has the talent for all of them.
darwin - I agree with you that the most important thing is they compliment each other, and like you prefer my back-rows to be complete players. However - and I don't know whether you agree with this or not - once you've got the three best players that compliment each other, they should be picked, irregardless of the number of the back of their shirt at club level, which after all might be two 7s and a 6. The only slight ****le in that is the 8 has to be able to control the ball at the base.
I also disagree with you about Croft, who for me gets through a lot of quiet work in the tight on his good days and is as complete as Robshaw and Wood. Yes, his good days haven't been so frequent recently - I don't know whether that's the coaching messing him around, lack of fitness, just simple poor form - but he offers a hell of a lot if we can get him back to form.
Well, I have to disagree. I think you need to have players whom are fimiliar with the roles and can play them at a complete standard, before you select them over a specialist. Take Adam Thomson for example. He's been moved from 6 to 7 to 8 most of his career. Now I think most people would be happy to say he is one of the better loose forwards in New Zealand (admittedly I don't especially rate him), but he would be ahead of the pecking order of Daniel & Luke Braid, Scott Waldrom and Matt Todd. Despite this, I'd pick any of them to play at openside flanker above Thomson. Vito and Messam are in the same boat. Both very good players, but when they are put at openside they lose their effectiveness. Why? Because they are not openside flankers. When Rodney So'oialo was in his best form, and then trialed as a replacement 7, he went downhill to the extent that there was no recovery.
To use examples outside of New Zealand, South Africa's loose trio was at it's greatest when they put a genuine fetcher in Brussow in openside over big hulking looseforwards who were not natural opensides. It's always occured to be that the reason England's loose trio has never really been a threat to me, is that they've constantly played Lewis Moody, an obvious blindside flanker, at openside, and thus they don't pilfer as much ball. One of the last decent opensides England has was Neil Back, who as Darwin mentioned, complimented the other two very well. We even see what happened when Australia didn't take the best openside but instead took the next best loose forward. They lost against Ireland. Had they taken Phil Waugh or Beau Robinson I would have predicted Ireland losing that match.