in regards to how nasty of an offensive player Chris Webber was before his injuries, I'll give you that if you want to compare him being near the caliber of Duncan and Dirk if you want to focus only on the offensive side of the court, but Chris Webber in his prime wasn't close to the defensive presence Tim Duncan was.

The Dirk and Webber comparison is might be fairly close one because Dirk was pretty lacking as a defensive player and Webber had better ball handling and slashing abilities in his prime compared to Dirk, but trying to compare him to Duncan is a losing proposition IMO.