Seeing them play.
Bentaleb and mason are very similar. Tidy, can keep the ball, work hard. But I feel this is the height of their ability. I don't think either really offer enough - they're not going to break up play and be a rock for us, they're not going to make splitting passes open up the attacking play, they're going to drive forward with the ball, they're not going to get goals. They're just average, tidy. Who give the ball away a lot.
Kane isn't a striker. He's okay in a number 10, better than j thought. But yltimstely he's not going to get you 15 premiere goals in a season. Probably ever. Too slow, too cumbersome, not clinical enough.