That's all true but I don't see how it refutes what I said.
The 787's been in production and delivering aircraft for 4 years longer than the A350 XWB, which is still ramping up [1]. If that's not a head start when we're comparing delivered aircraft between the two then I don't know what is; the fact that Airbus let Boeing have that lead by wasting their time trying to hawk an A330 with revised wings and engines is neither here nor there.
> Airbus plans to increase its production rate from 10 monthly in 2018 to 13 monthly from 2019, while the Boeing 787 production will increase from 12 to 14 per month in 2019, and six A330 are produced monthly.
1: https://en.wikipedia.org/wiki/Airbus_A350_XWB#Production