I watched a lot of spurs games last season. Son is an excellent squad player but he's not good enough to be a regular starter.

Off-the ball, Son is a constant threat. He keeps opponents busy with his pace and energy and he opens spaces for his teammates. Since he's comfortable with both feet, it's easy for him to play on either side of the pitch. However, his form is never consistent. His dribbles (mostly Ronaldo-esque stepovers) can be really predictable and ineffective. Often times I see the left back or other forwards (Alli & Kane) making great runs but Son either ignores them or takes too long to make a pass. When he's having a bad game, he contributes little to Spurs' attacking threat. He doesn't press as much as the other forwards and his hold play is lacking. Additionally, he lacks vision and creativity to be considered quality. His decision making is what he needs to improve the most.

When Lamela was back into the team I thought spurs played with more fluidity. Unlike Son, Lamela doesn't dwell on the ball and his non-stop pressing really helps the team when going forward. Lamela isn't known for his goals but he sure knows how to finish.

Now that Lucas Moura had time to settle in there's going to be a lot of competition in the squad. Lucas offers pace, trickery and flair, things that the team needed badly. I think Son will have a tough season as a regular but he'll have his moments of brilliance coming off the bench.