The rules assume you aren't embellishing injuries to play with a roster that's functionally more than 25. MLB already warned the Dodgers about their use of the 10 day DL for this purpose, but most of the time it wasn't too egregious because there were optioning games they could have done to achieve the same result. That's not true of the playoffs, so if they try to do the same thing to get their star player a few days of recovery without playing with a 24 man roster, MLB needs to say no.