IIRC Gillespie and Kasper have been roughly equivalent in FC since the Ashes... and the point is that I don't think Gillespie suffered ONLY a lapse in form - I think his body isn't what it used to be, and I think his best now is simply not going to be as good as his best was.
I agree that Dizzy currently is not the same Dizzy that was bowling at his absolute peak years between 97-2004, but the experience that he has can't be taken for granted IMO. Firstly i don't think him & Kasper's form has been that equivalent since the Ashes especially given that Kasper has hardly bowled a ball since the Durban test last year, but anyway since the Ashes his record in AUS & ENG:
2006/07 in Australia
2006 in England
2007 in England (to date)
2005/06 in Australia
Hasn't been that bad to be totally written off of playing in Australia again. Especially given Australia have tours to the sub-continent next year where i think Dizzy's experience will be very useflu given the fact that Lee & Clark plus all the youngsters don't have much experience bowling on those flat pitches.
And thus, I think Lee is, and Hilfenhaus has the clear potential to, a better bowler than Gillespie.
Thats going over the top a bit, DIzzy at his peak was one of the best bowlers over the past 10 years, Lee even though has improved a lot since the 2005 ashes has a fair way to go match dizzy exploits at his best & to say so blatantly that Hilfenhaus even though he certainly seems to have the tools to do well at the highest level will become a better bowler than him is definately under-rating how good a bowler Dizzy was.