Thoughts

Failed coach, foolish choice of t20 captain, star bowler banned, YK behaving with an inflated ego. Just about hanging on to Pak Cricket....

Myth that SA was a brilliant aggressive leader 

Ball Biting Incident
Ran away from Test Captaincy
Lost more than he won
Violated code of conduct repeatedly

No stability - controversial figure
No substantial performances besides minnows 
No brilliant team results

Didn't beat a higher ranked ODI side in series
Lost 4 consecutive T20 series
Quit Tests mid way through a series

Attacked his players in the press
Leaked dressing room secrets
Gave irresponsible media statements
Fall out with Waqar Younis
Called Indians "less big hearted"

Wasn't aggressive like some say he was
2011 World Cup achievement overplayed - Kenya reached 2003 semis

Test and ODI skip should be same:
In an ideal world
Teams are better served
Avoids factions, groupings and politics
Reduces Pressure
Improves stability
Every team barring WI and SA this is the case, but even there the Test captain is in the ODI team - player
Easier for teams to progress without dramas and hassle
Great captains have to lead their sides in all formats or most formats - aspire for greatness
If there is one captain that can captain well, then having different captains is pointless
A Test Captain is a complete product who should be able to adapt to different formats demands