You need a fair sized stable of pace bowlers , especially for ODIs. Agree Wood is the ideal missing cog but that is only really an important issue for World Cups - when you always hope your main assets are fit...
Ball , Willey , Curran - probably test one or two more over the next year or so. Also remember they need experience to reach their potential : one might argue we have already seen the best - and the limits - of Willey ; but Ball , for example , is still a babe in arms.
I do like the look of Curran , at least for this form of the game.