Can Microsoft just close it’s acquisition of Activision before Tuesday July 18th, 2023?

It looks like Microsoft is waiting on the CMA for approval. To avoid renegotiating a higher price with Activision, will Microsoft just close before Tuesday and deal with any issues from the UK later? Activision's business has been way better since the acquisition with CoD: MW2, huge Diablo launch, and mobile outperforming the industry.

I wouldn't be surprised if Activision wanted at least $10 billion or maybe more. Any penalties from the UK would probably be less so it sounds smart for Microsoft to just close the acquisition as soon as possible.