I think there's a tendency today with coaches and fans to want to rush players. Jake is on a more typical curve and has been improving every year in all aspects of his game.
I don't think Green is particularly patient when it comes to full line chemistry, no. He seems to like the idea of line pairings (which I'm basing off an interview of his, he mentioned liking pairs of players), two guys left to gel with the 3rd spot open for him to make changes on the fly. Thats not a great position to be in for a young player imo, it forces them to have instant chemistry while the other two get time to gel. At least thats how I see Green. And he's had some success with that model, but its not going to be ideal for everyones development. I'd much rather he just leave Jake-EP-Bo and Pearson-Bo-Loui together for a few weeks and let them develop two solid lines with a bit of time to learn off each other. Its not going to happen in 3 shifts.
Willie was just an bad coach.