The Topster has never been that great at rapid time controls. He even lost the 2004 FIDE title to Kasimdzhanov that way.
That doesn't seem right. Topster never had any title that he could lose to Kasimdzhanov. Kasim won it from Pono, though I do think he played Topa and Adams in the semis and the finals respectively, if I remember correctly. Pono didn't even participate in that event, I guess, after his fiasco over the Kasparov match.
Topa won his title in San Luis, which was held after Kasim had won his. And Kasim was an invitee to that event as the existing title holder. Topa, Anand et al got invited by virtue of rating. In fact, it can be said that Topa won it from Kasim, than vice-versa.