Spurs were still in the title race and in good form before Kane got injured in mid Jan. 48 points from 21 games. The wheels came off after that - even if, initially, the team managed to scrape some narrow and somewhat fortuitous wins from a run of poor performances. 23 points from the remaining 17 games. Kane made a couple of comebacks but was never back to full fitness and the team never rediscovered the form and consistency from the first half of the season.
A fully fit Kane is a phenomenal player. Superb finisher of every type of goal. Excellent creator too. Works hard for the team. Even allowing for team affiliation and rivalry, I genuinely find it baffling that so many on here dismiss him as average / tap in merchant / penalty taker / selfish. He is rarely average other than when unfit or when used incorrectly (Hodgson's England). I concede, though, that he is good at tap ins (excellent movement and positioning); penalties (cool-headedness and hours of practice); and sometimes selfish (like most top strikers, because they back themselves as being more likely to score than anyone they pass to). But he's also a brilliant passer and very unselfish when he's certain that a teammate has a better chance of scoring.
You don't get to score the number and variety of goals that he has scored in the number of games that he has played - in the Premier League, the Champions League or for England - over an incredibly consistent five year period without being an outstanding player. If he gets himself fully fit and refreshed over the summer (he's barely had a break for three years), and with a strengthened Spurs squad behind him, he'll quickly remind the doubters just how good he is next season.