If I put Jose and Poch to one side for a minute, what is abundantly clear is that Davinson hasn't achieved the levels that we hoped for when we bought him for £40m in 2017. That being said, he is 24 and has his best years ahead of him. There are clearly tactical reasons why it is not setup well for him, but there are also some moments where in any setup he lets himself down.
I think you also have to put Toby, Dier, Rodon and Japhet to one side in this conversation. Davinson, 24, is contracted until 2024 and Spurs need to figure out whether he is our long term answer. If he is, then give him a new contract on more than his £65k a week. If he isn't, then consider cashing in and find someone with a longer career runway.
What this doesn't distract from is the bigger problems in the Jose setup. There is simply no running off the ball and no chance of playing an effective possession based game. Every game, we know we will mostly look the inferior side and just wait for the few golden moments from Kane or Son which might get us some points. That is no way to exist as a Spurs fan and we know the root cause.