pinnacle of his distinguished career, and that says a lot

For more than a decade Australia have begun every series as favourites, but the series in India is likely to give them some sleepless nights and a lot of food for thought.
Indeed, the moment of truth has arrived for this new-look team hoping to forge its own reputation without the likes of Adam Gilchrist, Shane Warne and Glenn McGrath.
The heavy hitters are gone and this is the first real guide of what life will be like in coming years.
There's arguably no greater test of character and skill than a tour through India.
Gilchrist described the epic 2004 win as the pinnacle of his distinguished career, and that says a lot because he was involved in only two losing campaigns. (ANI)

Please explain the emboldened parts to me.