Poch has never played his CF within the width of the 18yrd box. Kane, was criticised by many pundits (Shearer in-particular) for "not" playing within the width of the penalty box. If anyone doesn't like our CF pulling out wide and dropping deep then this has nothing to do with the player but how Poch wants his CF to play. No issue whatsoever debating this "function" but it is wrong to criticise the player for doing what the manager wants him to do.
Of the two, Kane last year and the season before excelled at taking the ball with his back to goal but creating space for himself to turn with his first touch (something he couldn't replicate for Eng or us at the beginning of the year). Janssen doesn't look to turn but he holds the ball up with his back to goal and waits for a player to offload. For me this is the biggest difference between Kane and Janssen. This system works if we have at least 3 players to play angles off (triangle). When it doesn't work is when the distances between players is far, the clips show this. There is an argument that we should "mix it up a bit", a first time ball to Janssen might have enabled him to drop a shoulder, or let the ball run across him and turn. However, it is a higher risk option though as a) Pass has to be inch and pace perfect b) hit first time c) Janssen has to know that the ball to him is for him to turn and not hold up. d) It then relies on Janssen beating the defence on his own. Basically the % of the opportunity diminishes. The counter argument is we loose momentum of the attack as the player on the ball is looking for an overload opportunity and slows it down by a) not releasing the ball b) slowing it down by cutting inside (if out wide) c) or slowing it down by passing out wide (if in middle).
Spurs always look for an overload in an area of the pitch and in the examples shown, had the ball gone to Janssen there is no overload and therefore the likely outcome is for him to lose the ball as he is outnumbered by Oppo players. It has little to do with Janssen and more to do with the 3 behind and the fullbacks supporting the attack by being closer to the striker and having numbers to create an overload.
FWIW
I think he is nothing like Soldado. I recall loads of people defending Soldado by saying his link-up play was good, I thought his link-up play in the main was shit. I didn't see anything positive about Soldado in a Spurs shirt, I thought he was shit both with and without the ball.
I like Janssen, I like his aggression, work-rate and hold up. So far his weakness is that he is predictable, if I was a defender I am only looking for him to hold-up the ball and back into me, he isn't looking to turn and attack. I don't know if this is deliberate ploy from Poch i.e. Keeping it simple and do the basics right or that he isn't very good at getting the ball out of his feet and trying to turn a defender.....Time will tell.