You can't look at when the PG is starting to determine the records. In some cases just because someone started doesn't mean they played significant minutes. That's why 82 games breaks it according to lineup and not who started the game.
Also, most of Jack's starts happened when the Raptors were doing great during that middle stretch. Were the Raptors doing great because Jack started or was Jack looking good because the Raptors were doing great?