it will take a couple of live real games to get the fluidness of Westbrook and harden together.
Maybe, but its already enough if they can enter in the playoffs while their chemistry is improving.
If I remember correctly, when Kawhi played with the Raptors, chemistry was never a problem because he was able to make Toronto improve although they didn't finish as the number 1 rank, so its possible with the Rockets especially that these two have already played together with the OKC before.
Kawhi and everyone else in the nba is two different things. Kawhi has proven he doesnt need a "side" mate to play with. Stick him on any team and they will contend. Those types of players are rare and not like harden and westbrook. That is a type of tandem that will need some live in season action before it becomes a finished product. Will it work, maybe...but definately cant tell from preseason if it will or wont