Dhoni promoting himself at fourth spot is very unlikely. I often expect him to come at no. 4 and also most of the pundits have talked about it and belt-up themselves as he's rarely seen while batting there even though he's capable to hold the middle order and score bunch of runs too. He thinks no.6 / no. 7 is a difficult position to bat on, and imo no other batsman in team was as able as him to do so, but until last year. He hasn't been able to keep his old finishing ability by now and it seems he is not regaining it, so he should really choose to play at no. 4th, but again he won't listen to anyone.