The divisors are set lower with a 145 hour min guarantee and a planning divisor of 155. This is by design to match the current remuneration on the A330. So, not really a fantastic outcome.
TCOB, not true. It has nothing to do with remuneration. It's because they are totally different hours ie Stick Plus v Credit Hours. Take the time to do the sums when the entire package is released and you'll see how it all works.
The B787 S/O pay rate is above A330 S/O rate for the first four years. It is planned that all new hires will go to the B787 as S/O's and it is extremely unlikely that any current S/O's will be forced to go there. If they are, there are protections in the package.