iirc, Mac was playing well before the 3rd line comment. He had a great game and then Cronin said the third line comment.
I think part of the improvement is due to better talent around him. Usually it was Fabbri and Leason on Mac's wing. It coincided when Cutter was dropped to the third line to Mac because Cutter wasn't working with Carlsson-Killorn. That move sent a spark in Cutter's production. Then the team tried him at LW with Carlsson and the top line started to produce. Afterwards, he was sent back down to the third line, but with more offensive talent with Colangelo's call-up: Cutter-Mac-Colangelo. That's a heavy, cycling line where both Colangelo and Mac love to crash the net while Cutter can start zipping the pucks to the net from anywhere when he cycles up the wall with the puck. Now, Z gets sent down to the third line because he wasn't working with the top line in Carlsson-Killorn. Z looks more dynamic with Mac centering him and they just have to figure out how Colangelo can fit into that duo's chemistry b/c Z isn't a cycler like Cutter.
There's a common theme with Mac. Put talented offensive players with Mac and that line will score. Last year, he centered Vatrano and Strome. That line was hot potatoes in the first 20 games when Mac was playing healthy. Here's a screen shot early last year, after 33 games, of Vatrano and Strome's production with Mac and without Mac. Vatrano had 15 goals in only 26 games with Mac last year. This year, Vatrano has 20 goals in 72 games.
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Mac shows adaptability with players around him. It looks as though he understands other offensive players and where they should be. With lesser talents, maybe those lesser talents aren't where Mac thinks they should be and it looks like he's the crazy one.