From the same interview:
"It's all about puck possession here," Mantha said. "They want us to keep the puck as long as we can, make the plays at the right time, and if it's not there, they want a lot of shot attempts or to get the puck back. They want to control the play basically for the whole game. Compared to Detroit, which lately was more of trying to dump a little more, and obviously the confidence wasn't as high as over here."
Having to play Blashills brand of hockey probably kills what little is left of that motivation too. Especially for a skill player like Mantha.
The biggest winner of that trade was Mantha.