Kallis cutting back on work load was actually ideal though. It lengthened his career, yet he was still always there to provide relief. And not only was his wickets always timely, the value of his wickets and scalps were insanely valuable. He broke partnerships, he didn't clean up tails.
And when he wasn't bowling, he was performing at an ATG level in the most critical fielding position on the field.
And people like to pretend he wasn't an ATG bat, but name a perceived flaw of his that isn't also associated with guys like Gavaskar.
Of the fraud 4 of the 2000's he had by far the toughest home conditions and by the end of his career he upped his scoring rate by quite a bit, especially when required.
Not to add that his skill set and numbers would transfer to any era, including today's way more than Imran's would. And that's not disputable.
I think
@Migara said that only Sobers can be ahead of Imran, but Imran is way closer to the likes of Kallis and Hammond than he is to Sobers.
And in before anyone says that's ridiculous, let's compare Imran and Hammond.
Imran is ranked here 8th as a bowler, behind the likes of Marshall, McGrath, Hadlee, Steyn, Warne, Murali and Ambrose. In the wider cricketing community you can add Lillee, Wasim and O'Reilly to that list, with arguments for Holding. Generally though he's in that group with Lillee, Donald, O'Reilly, Wasim and Holding.
Hammond we rate around 8 and 10 as a batsman, general community about the same. And he's seen in that group with Sunny, Chappell, Headley, Ponting and Pollock. Though in some circles he's seen even higher.
Basically the same, possibly slight edge to Hammond.
Imran's secondary skill is his batting, Hammond's is his catching. Only in CW is lower order batting ranked higher in terms of auxiliary skills, or factored into team construction. When one listens to former players and pundits putting together teams, far grater consideration is paid to fielding and especially catching than lower order batting.
In any event Hammond is the GOAT and at least on par with Imran, who's numbers were boosted by..... Not outs, his post bowling stint, down hill skiing and of course home advantages. Even then he had a rpi of 30, using the preferred bowling cutoffs from '74 to '88 it drops to 27. Strictly away from home, 25.
Hammond too was pretty useful, even if not all rounder standard with the ball, with a wpm of over 1 prior to returning after the war.
Went way longer than I intended, but yeah, they isn't much if anything that separates these guys as cricketers.