To try to summarise the last 33 pages:
OS contravenes the intent of Schedule K by employing non-BA pilots to fly BA work, albeit out of Europe from which BA could not operate when Schedule K was last agreed.
Research the pay yourself, but BA DEPs are slightly better off than that.
OS would take transfer traffic from BA mainline immediately. More importantly, it could draw investment (new aircraft) away from BA mainline and let LHR wither on the vine until expansion there is finally approved in about 2020. Once established as a Trojan horse, OS would be able to act as a strike-buster at LHR on the command of the BA board (current agreements would be swept aside, certainly in the event of a future strike by mainline). Once OS were established, BALPA would be emasculated.
The strike ballot closes on 20 Feb, results announced very shortly thereafter, I should think. Earliest date for industrial action complying with the law is 28 Feb, latest is 19/20 Mar.