You do realize that neither series has a qualifying tire, so its a moot point.
Some riders ran the soft tyre for the actual race at some circuits last year, but usually not casey or valentino; their riding styles appear to be better suited to hard tyres, and in particular to a hard tyre no longer produced by bridgestone which also suited the ducati better as well. I still think stoner's and ducati's woes last year were at least partly related to tyres not suiting, and the bridgestone control tyre appeared to suit lorenzo better than rossi as well.
Interesting that stoner appeared to do as many laps at sepang as anyone else, including race simulations; he has been heavily criticised for only doing short runs on the ducati in recent seasons. My memory of 2007 was that he did plenty of laps and race simulations then, so perhaps at ducati recently he was only doing short runs because he was constantly searching for a good set-up (which going on valentino's experience thus far may not exist) rather than laziness, arrogance or whatever as many speculated.