For the goalies (unless you have an elite G like Öttinger, Hellebuyck, Vasilevskiy, Sorokin, Shesterkin): Complete lottery ! (ok, I'm exaggerating a little bit)
In an era where tandems (or 1A/1B) become more and more the norm, it's really difficult to have any clue on how a goalie will perform in the beginning of the season. Demko was injured and awful last season, now he's like God. Talbot was good for the dump, and now he's skating on the water. On the other side, Gustavsson has become an AHLer, Schmid and Vanecek are terrible, Markström has a hard time too.
Even constant and top-tier goalies are not safe. Varlamov was about to claim a timeshare with Sorokin, Georgiev was fantastic in October and then horsesh!t in November, Detroit is currently running three goaltenders. Two or three bad starts in a row and your undebatable #1 position is in jeopardy. This position is so versatile. Maybe in February we will be all fighting to grab Kähkonen lol.