How Much Can Canelo Improve Going Forward?

Canelo is 27 years old, but I can't tell if he's entering his prime or hitting his limits, especially at 160. Canelo's power was decent below 160, but overrated imo. He KO'd outmatched opponents, and floored Austin Trout. Other than that, he moved up to 160, and stunned a smaller Cotto a few times. I don't see his punches doing much to any top-level middleweights. Not only that, but these middleweights are bigger and stronger than nearly everyone Canelo has ever fought. His stamina, in particular, has concerned me for a while. I've noticed that he tends to fight in spots, and wear himself out. He gassed out against Austin Trout, and wound up getting walked down onto the ropes at points. If my memory serves me, Canelo spent most of his bout against Liam Smith, on the ropes. In his most recent fight, he slowed down after the 3rd round, even though his opponent, GGG, hardly ever went to the body. It's like Canelo struggles just to be active. Canelo's not very light on his feet, either. He showed movement against GGG, but he was walking from one side of the ring to the other, and staying on the ropes. I think that kind of movement would not help him against fighters like Daniel Jacobs, Billy Joe Saunders, Jermall Charlo, Sergiy Deveryanchenko, and Demetrius Andrade. He's shown that he can rely on his upper-body movement for 12 rounds. If he gains enough stamina to sustain a consistent offense throughout the majority of a 12-round match, I can see him having success at 160. Top-level middleweights should still give him hell, but better conditioning would benefit him greatly. What do you guys think? Do you think that Canelo will improve enough to overcome his adversaries, or do you think that his shortcomings will get the better of him, eventually?