I think the biggest thing about the Tottenham game was how much more compact the formation was.
Ole's obviously been trying to make us more free-flowing in attack this season, as opposed to the counter-attacking style that we've played throughout both his tenure and the Mourinho days.
You can see the trend here:
Everton
Leicester
Atalanta
Liverpool
Tottenham
The 4-2-3-1 would often turn into a 2-2-6 in attack. The gaps were frankly huge, and anyone with two eyes could see that nobody knew how to deal with it. But against Tottenham our 3-5-2 became, at worst, a 3-2-5. And with the distances from front to back so much closer, we were able to control the spaces much better.
I think the biggest reason for our downfall in recent weeks was that Ole and his coaching staff were trying to change a style of play that the squad had become used to over the last 6 years. It's an indictment of the coaching staff AND the players that such a simple shift in philosophy couldn't be implemented. Though I can't help but think that it might have been more successful if we'd had a proper pre-season.
The 3-5-2 is probably going to be the default for a few weeks while the players get their confidence back. Then I'd expect us to go back to a counter-attacking 4-2-3-1. Assuming Ole stays at the wheel that long.