Similar suspicions also hang over Bolt as with all WR holders in the last 40 years. Lewis competed across the sprint distances and also won gold at the long jump during the same Olympics. In terms of sheer athletic performance he was immense.
Not doubting that at all, although Bolt has one fewer Golds despite only having competed in 3 of the 4 events Lewis competed in. Bolt's world record in the 100 is far beyond anything Lewis accomplished during his entire career. Also, Bolt's aura and global popularity far exceeded Lewis'.