MAG’s overarching aim will likely be to evenly spread capacity than to neatly place alliances and business models in neat boxes. That’s not to say there aren’t benefits in, for example, placing oneworld carriers together but there are many other, more pressing, priorities.
As for passenger spend, with no figures to support my belief, it will be the bucket and spaders who spend the most at MAN, particularly given the mid-range retail offering. Many of those will be travelling on a LCC to somewhere like ALC or ZTH whilst next door there will be a company aircraft boarding for GVA or NCE, each with a number of Coutts card holders onboard.
My point being, at MAN at least, it’s also very difficult to neatly place passengers in neat little boxers. There are just so many grey areas.