I basically didn't play 2k15, so forgive me for my ignorance, but there doesn't appear to be a way to edit situational lineups (bench, quick, etc.).
A) This is annoying.
B) I believe this could fix the hockey line substitution issues with the game.
2k just sets up the first subs to be 5 bench guys. There is no strategy involved, unlike the NBA, where you usually have a few starters interspersed in most bench units.