You don't think it's real during a stretch of a game where a team goes on say, a 17-5 run or something like that?
I'd agree it doesn't have much to do on a game to game basis but I wouldn't say there's absolutely zero carryover from the game before. If team A is dominating team B a few games in a row, it has to have an affect & take it's toll on each team mentally. Team A rides the momentum & continues to play well, while team B continues to play like ish & sucks it up. A lot of it is between the ears.