Get what you're saying, but that money would have gone farther had he not waited until the last week of the window. Prices only go up.Some of what you say is true, Spurs could rebuild with the Kane money, but you are forgetting one key point - City haven't met Spurs valuation. Why should Spurs sell Kane at a cheaper price than his value? You seem to be listing all the reasons why Spurs are stupid for not selling, but missing out that City haven't made an offer high enough. That is the single main point why the deal hasn't been done. If City meet the price, Spurs will sell and rebuild, but if not will keep Kane.
Another thing, the Kane money won't go far in the market. Vlahovic is being priced at crazy prices, Martinez they wanted 80 million, both now seem to be unavailable, Spurs would only be able to buy two players with the money and they will carry their own risks.
If Spurs sold Kane and were not able to sign replacements, the season would be over before it began.
There's also something to be said about having a realistic valuation. I can value my used underwear at 1m a pop but can't complain nobody is meeting my valuation when it doesn't sell. I won't pretend to know what Levy's valuation is but if its 150m + add ons as reported he's not getting that, and he knows it, which brings me back to my orignal post.