While I do see him batting up at No.5 from his customary No.7 in test cricket, I would be very reluctant to move him up further more, since he is also the wkt keeper. You have to keep it in mind. In case we are batting second, you don't want to see him batting early after keeping the whole day or two. Its very draining. So, No.5 but not further up.
"City of Champions is better than Hockeytown" - Coach Dan Bylsma of the Stanley Cup Champions Pittsburgh Penguins.