As for clean head snapping jabs I think they probably were pretty close since Canelo also landed some. The majority of GGG:s jabs did no damage, but rather served a purely tactical purpose in setting up other punches and keeping Canelo to get set for his own.
I agree that GGG showed a good defense and have said as much, but I don't know in which threads. I don't agree he made Canelo looked inept, though. It was more a case of GGG deftly rolling with punches to take their steam off rather than making Canelo swing wildly through empty air. All in all Canelo still showed the better defense, even if the difference wasn't as big as in the first fight.
The problem with the above, is that it is entirely predicated on Canelo himself not having had a strategy. In what way did Golovkin show diversification? Golovkin doesn't fight well on the inside, couldn't find the body, rarely if ever countered or punished Canelo for his mistakes and, in fact, for the third time in four bouts, relied almost exclusively on the jab, which would have been fine if it was shutting Canelo out, but it very obviously was not. Even if you want to refer to this as Golovkin's 'strategy' and 'diversification', it wasn't helping him make absolutely clear inroads and, to my mind did not and does not demonstrably separate him from Canelo.
The simple fact of the matter for me is that when Canelo was fresh he dictated and was the better man. GGG came on when Canelo tired. I'm not convinced that if Canelo didn't tire somewhat GGG still would have come on. Canelo lost that edge. He lost his sharpness and sting. Full credit for GGG coming on but i think it was more a matter of Canelo tiring than strategy and adaption.