Bah, What none sense. They are one step ahead of you. I believe the reason they give Khali a title reign is because 1. they want to surprise the fans(?) and draws them to Smackdown and 2. Khali is the new face and a main event ready guy.
Now, i know you none intelligent people(?) are thinking, how is he the main event if he cant even wrestle and speak English? His in ring ability is just fine to me; compare him to the Undertaker or Big Show, neither can entertain you throughout the match. Big people are used to be the ultimate obsticol they put for pushing smaller people; a good example is John Cena's absolutely berserk rampages(?).
Conclusion, Khali is perfect. If he can bring up a bigger heat than he can right now, he's the top guy. His charisma is great since he can make people laugh(dont deny it) and his in ring abilty is on the right track, he can always improve