WW is fighting for his career and job. He has seen the debacle and decided he can do better himself. By assuming full responsibility, directly, he lives or dies now by how the T4 --> T5 move goes.
Gareth Kirkwood and friend have paid with there jobs. WW has sacrificed them to try and save himself.
It is now Willie Walsh in the firing line and on deck. The question is, can he save himself, and can he save BA?