I don't assume pistachio is a better player than Kaboul. You've probably hardly seen him play. You've already decided he's better in the prem than Kaboul which is presumptuous.
But my MAIN point is even if he is a better player than Kaboul (he could be) he will still look terrible like Jan did with thick wingers/wingbacks like Rose, Lennon, Townsend and Naughton watching the ball and not his back.
I live in San Diego, surrounded by people that speak Spanish and watch Liga MX and La Liga religiously. Trust me, I've seen him play. Now, I've never really analyzed him to the degree that I do with Spurs, but that doesn't stop me from being confident that he would do well in the PL.
I'm not sure why you expect wing backs to cover center backs. Is Rose supposed to drop back and play sweeper?? That's just flat out not how the game is played anymore. Kaboul should be a fucking rock and one of two players before Lloris. He should be extremely strong in the air, and his passing should be excellent. He had amongst the worst passing percentage of the entire team.