We don't need to extend Westbrook now anyways. We can just trade for him and max him out next summer, after we sign Gordon Hayward, if it looks like Jaylen Brown might take a couple of years to develop.
Also, not worried about Westbrook's injuries. He put up 28ppg two years ago or so, and he's 27 years old so not worried at all. He is a little reckless/aggressive, gets hacked a lot but it doesn't mean he's injury-prone. I'm all for this trade even if we have to overpay a bit.