You also wrote:
"Obviously he'll get a decent amount of chances at Spurs, so that should count in his favour,"
You were wrong about that.
Can't rag on the guy for (not) missing chances he hasn't had.
Yes and no. Obviously lack of chances is a factor, but that is largely his own fault for not getting into good positions. So, so often we see him at the edge of the box when he should be in position to finish a cross.
I actually quite like him as a player, but he's not doing what we need at the moment.