Canelo looked nigh on indestructible in the Smith fight, but so did GGG from Proksa through Lemieux or even Wade. Also, any version of GGG is a very different and much more dangerous fighter that Callum Smith and would take the fight to any version of Canelo. Somewhat echoing the above sentiments that Golovkin gave Alvarez two of his toughest tests, I'd say 'this' Canelo versus 'that' GGG would be very, very competitive.