He's gotten tougher. With a bit more defensive positional awareness I think he can do a top job as a Modricesque CM in the years to come. Personally I think he might have a higher potential in a creative, playmaker CM role than as an AM.
I certainly never invisioned Christian playing in CM over his first two seasons. He was easily ahead of Holtby and Siggy as our best number 10. Now after just over a season and a half under Poch he seems so similar to modric, defensively with his constant terrier like persistence and niggling tackles and his ability to always find time and space. I can really start seeing him as the main clog in the team to dictate the pace of games in a similar way Luka did for us.
Also with Dembele, Alli and Mason to name a few, I think the spot behind Kane has plenty of good options.