Besides which, bmw have probably not bother developing the engine for the last 6-9 months, so when they enter F1 it over inflates their performance compared with Williams, appearing like somehow on their own they are now preforming better.....

If you were BMW and it was V8s next year and you were getting out of Williams, would you continue to develop the V10? Engine probably has a lot to do with Williams lack of performance this year I think