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Idk but I think CAT would be pretty pissed off at the CMA if they went ahead and blocked the deal again, CAT were pretty annoyed at having their time wasted already and didn't want to delay proceedings unless CMA proves to them they had an actually good reason to delay proceedings and the CAT judge was leaning a bit on assumption that CMA would end up approving the deal without saying it outright.
In addition, CAT doesn't usually allow new evidence into trial, they only assess based on the evidence provided throughout the investigation at that period in time, but since the CMA has re-opened the case, Microsoft can and already has submitted new evidence, from EU's approval/commitments, to the Sony contract, to FTC's loss, they even submitted Google/Nvidia saying that Stadia/GeForce competed with Consoles (I.E. Same Market).
So if the CMA intended to simply block the deal again, they've just let Microsoft strengthen their case, Lol. If they always intended to block it, then it would make more sense to carry on with the original CAT trial than allowing Microsoft to submit a bunch of new facts and evidence. I also think they may be some political pressure, gov can't do anything legally to them but they could pass legislation in the future to curb their powers.
