I like the idea of having a guy at 5/6/7 who can knock the ball around at run a ball and turn ones into twos. The role McCullum/Marhsall/Vincent played when they were down the order.
Elliot isn't a number 5, thats for sure but I think he can play a role.
At the moment with How and Flynn horrendously out of touch I think Elliot is probably the best option we have available, Williamson may be a long term option but not quite there yet.
My top team with Piggy and Jacob available would be
Ryder, McCullum, Guptill, Taylor, Styris, Oram, Broom, Vettori, Mills, Southee, Patel. Pretty strong team looking at it to