I think that IF Joseph keeps up his defensive play and attacking threat as shown on Friday, then he'll be very hard to drop (even Lancaster will admit this). Assuming this is the case, we now have a very capable 13 who can lead the defensive line, which imo greatly diminishes the need for Barritt. Thus I think England have the following option at 12; Twelvetrees, Burrell, Eastmond and Tuilagi.
Eastmond, as long as Ford and Joseph play, will unfortunately not get a look in because we do imo need a big presence at inside centre to break the gain line in the confined spaces, especially running off Ford. So for me, it's a 3 horse race running to the world cup- Burrell offers a greater running threat than 36, however distribution, kicking game and defence are probably a little down, but will 36 ever give consistantly good 80 min performances?
Now onto Tuilagi... can he play at IC? Certainly offers the biggest threat and could potentially be dynamite outside Ford, but is his distribution good enough or would he take away more from a symbiotic midfield relationship than he gives as an individual rugby player?
Case in point, France play Fofana and Basteraud, both mighty running threats in their own right, but the lack of cohesion and passing game, is detrimental to the team beyond the occasional piece of magic they might individually provide.
We saw Tuilagi and Joseph in SA and it was pretty uninspiring- the question is: has Tuilagi moved on as a rugby player since then to now make a better go of IC, or, will the introduction of Ford make a difference to how he might be used?
I guess what I'm trying to say is: Is the fact that Tuiagi is a bit of a crowbar in mid-field, over come by his potential individual brilliance (a la Fofana, or earl Nonu), and would his ball hogging ways be accentuated by moving him into inside centre? (one theory I have is that Tuilagi tends to thrive in the wider channels where he can build up a head of steam and use his big hand off to good effect- he tends to have a pretty good outside break using this) Certainly if he were to play 12 for England I would hope he gets some time there for Leicester (which strikes me as unlikely)