Not sure why this is being treated as rocket science. Just push over the annualized net loss of each first party game on GP. So that's total annualized expense minus income from non-GP sources like MTX, direct sales, steam/PS etc. If the game has net annual profit on its own, dev cost need not be pushed over.
If CoD cost $200 million to make and made $400 million on PS and PC, then it has no dependency on GP to cover expenses.
But if Indiana Jones cost $100 million to make and it made $60 million on PS and PC, then $40 million difference should be pushed over to GP.
The goal is to find if GP is sustainable. Not just profitable as an independent P&L. Without knowing this, there's no point celebrating it or claiming it to be a benchmark that others should emulate. Investors don't care as they aren't investing in MS game studios. They are investing in MS, which is making shitloads of money. Consumers don't care because they get a bunch of expensive stuff at no additional cost beyond subs. But in the long run, it affects the devs because MS isn't running a charity. And if it affects the devs, it is not praise worthy.
But if it all turns out net positive anyway, then we can set this debate to rest. Unfortunately, all we have is obfuscation.