Please remember that Apple created Webkit from KHTML, without them Chrome would have been way behind where they are now, both in terms of technology and pushing a new rendering engine. They may well have purchased Opera...
Toady Google have more resources invested in Blink than Apple do in Safari, but don't forget how we got here.
I know all that and I believe there has been controversy over Apple and KHTML. But, I see it as a matter that Apple started playing but dropped the ball for Google to pick up to move forward.
There's no telling where things would be if Google had gone a different route. What if they bought Opera? What if they forked KHTML themselves? It could have been better, it could have been worse. I don't speculate on that, I just react to what I see. Right now, to me, Google has been better about moving things forward with Webkit than Apple has in quite a while.
Toady Google have more resources invested in Blink than Apple do in Safari, but don't forget how we got here.