the captaincy is a tough thing for BD because basically the best players are developing and the older ones either haven't cemented their spot or don't have the best leadership skills. for example razzak is basically a lock for t20s and ODIs but could he be the captain? mash doesn't play tests and anyone what are his on field captaincy skills like? ash, don't really need to say anything...
so picking 3 different captains will be tough, mainly because you need a player who has cemented their spot, performs consistently and has the right leadership qualities. how many of those are their in the nationals et up right now? pretty much only shakib, but he's already burdened with being the #1 bowler, #1 batter and all the pressure that comes with that, to give him captaincy again, at this stage of the career means we'll most likely be sacrificing some of his development as a player.
besides shakib is one player not 3, which is what they're looking for.
All Time Test XI: 1 Hobbs 2 B.Richards 3 Bradman 4 Pollock 5 V.Richards 6 Sobers 7 Gilchrist 8 Procter 9 Miller 10 Marshall 11 Warne