If you mean who I think you mean, then scheduling isn't his problem. He'd planned for a 5 year timeskip, then realised that caused some narrative problems so dropped it. Except then he had to rework the arse end of the story due to all his plotting needing a timeskip.
On top of that, he has a character focused, over plot-focused writing style which sometimes leads to characters developing in ways the author wouldn't expect, which, in this case, requires him to put in the extra work to make sure the ending he has planned for that character makes sense with the new direction that character went. The problem with the TV show is that they didn't do this, resulting in characters acting out of character so they could get to the planned end point.
Anyway, to avoid this just being an off topic tangent, who's everybody's favourite girl so far? I think I prefer Maddie, cause she has sass. I hope she doesn't lose that when her and the MC make peace.