If you wanted to make light of the question of 'who to replace BGA' then I would be itching to say 'I think you could put in Mr Squiggle or even Steam Shovel and they would do a better job, but if you want someone really good' then list .....
A banking mate reckons Ralph Norris would have to be on the short list, but I think you really need to guarantee a nuts and bolts aviation person at least has great influence on any CEO or you will likely end up with another shemozzle.