the thing is that you can still play Gilly purely as a batsman, and Gilly is being used as a metaphor here, you can substitute Gilly with Langer's opening partner in tests, Hayden and the point that i made would still hold true, i.e. better option, along with gr8er impact
and i wouldn't pick Kallis while factoring his bowling. NOW, i don't rate his bowling that highly [plz dont go on saying how effective a bowler he is coz, imo, now he is not at his best as far as bowling is concerned]. i would pick him mainly as a batsman who can be used as a 5th bowling option. so the point that his bowling turns the pendulum in his favor vis-a-vis Ponting doesn't cut in for me .... from my PoV, Ponting potentially can play the full 20 overs at an amazing strike rate that can bat the opposition out of the game. Add to that Ponting's fielding and his ability to get some run-outs
in fact, i would not have either Kallis or Dravid in my team, same goes for Jaffar and C'paul
see, it's two different lines of thinking here .... and i don't try to justify what a team does and convince myself thats probably the way to go .... i try to see how a team does according to my vision
cheers