Kuldeep already has something which Kumble didn't, turn & big turn at times. Batters these days rarely leave their crease & the preferred mode of dismissal is lbw/bowled for most spinners, even outside of Asia.
By being accurate he could induce more false strokes, he has to keep it relatively tight though. Too much reliance on flight would mean that he's prone to being slogged out of the attack. Unless the length & line is spot on he could be slogged in front of the wicket (both sides) as well as be vulnerable to the sweep, or reverse sweep. Have you seen Kumble's tour of Aus in 2003/04 & that ought be the template for Kuldeep in Aus? With Eng, NZ & SA it's a bit different but IMO beating opposition batters with flight is a losing battle, especially outside Asia, with the overly flat pitches we see these days. Accuracy & consistency is much, much more important, so is keeping it tight.