There's nothing really crazy about this? Line moves I see for game 6 are generally from ~10.5 to 11.5 (Caesars, Westgame, Wynn, Stations, etc...), meaning CP3 out for game 6 was already largely baked in before officially announced. From what I can see, most Vegas sports books don't even have odds for game 7 yet.
The information that is available, such as CP3's similar injury in the 2015 playoffs (injured hamstring round 1/game 7 but finished the game, missed first 2 of second round), suggests that CP3 will be out or severely limited in a game 7. Sports books are not shy about getting in front of a number, and will move it quickly if they get big sharp money early (remember there are no sticky numbers like football's 3/7). Unless/until someone is giving specific information about how the line moved at specific books, accusing "Vegas" (because the various sports books are a hive mind, apparently) of some type of insider knowledge is just silly.
