I disagree though about your saying differentiation not taking place in the engine. It takes place everywhere, including the engine.
> almost all the work on Opera's new browser will be done by Google. That is why I said "outsourcing development to Google"
According to that logic, using any open-source component is outsourcing development. Doesn't make sense.
This isn't the case when you use a small open source codebase. But it is the case here when Opera is using an enormous codebase by a huge corporation, and just innovating in the UI and other modular features on top of the huge core.
False. Opera has said they will contribute to both WebKit and Chromium.
> But it is the case here when Opera is using an enormous codebase by a huge corporation
WebKit is not Google's codebase.