Zero chance of BA doing anything at MAN. They couldn't be bothered when they had the chance of running a mini-hub and use of their (part paid for) terminal, The overriding factor being that they would prefer passengers routing over LHR. And that CAPA report does include Walsh saying
"BA would face two unsustainable options: using a normal premium-heavy aircraft out of Manchester despite the limited premium traffic, or have a second configuration with lower premium seat exposure but at the expense of efficiency and scale"