Anonymous Modernist 1774

Hello, I was wondering if you could answer a question. In your section on American BBQ in regards to brisket it says to smoke it for 7 hours and then sous vide for 72. I was wondering if it is possible to smoke 3 or 4 briskets and then vacuum seal and freeze 2 of them, remove at a later date and sous vide then. What kind of negative impact would that have on the meat. Thanks.