As someone who has watched a lot of Ange and his football, I can say with near certainty that he's not just putting on a brave face.
You can all make up your own minds over the course of the season whether he's up to the task of managing Tottenham or not, but one thing for sure is that he's not the type to be fretting over any one single player leaving, Harry Kane included.
Good players will stand out in his system, but ultimately it's about the collective, not any one individual. His focus with or without Kane will 100% be on laying the foundations of the football he wants to play, because ultimately that's what he is, a system manager. And you could be the best, most valuable player in the world, but if you don't buy into the system and way of playing, Postecoglou will have no hesitation in bidding you farewell.
As for incomings, I'm sure he'd rather have had all business done before the start of the season, but I guess it's not a perfect world. Whether that's more likely down to Levy or just the reality of the market, you guys will know better than me.
One thing that was interesting at Celtic though was during his first summer transfer window, they were buying players right up until the end of the window. CCV for example was brought in with about an hour to go. Yet all that changed under Postecoglou from the next window onwards. That following January, they announced the imminent signing of 3 Japanese players before the window had even opened. Indeed, it got to the point where it was so well run that replacement players were being signed before players being sold had even left. This was in stark contrast to before he arrived.
