Johnson is playing against a soft Detroit team, Schwartz is playing against a tough Minnesota team
You must be confusing Detroit with another team. They aren't soft at all. First in on the puck, winning board battles, paying the price in all zones. Watch that series. Having big hitters doesn't make you hard, or effective, by default.
Johnson's a good player with a ton of speed. He catches defenders flat footed blasting through the neutral zone. He's had a tough series too. Broke through in few but not the world beater he was in the regular season. He's also playing consistently with Palat and Kucherov, which always helps.
Schwartz has been fine. Hasn't buried his chances....some of that is forcing the play. He's cutting to the middle a ton instead of taking a straight line to the net when he has a lane. That's frustration rearing its head. Tarasenko does it too. They both should just stay loose and play their game.
A big problem in this series has been a loss of identity going both ways.....Backes and Oshie are playing "finesse" instead of initiating physicality, Tarasenko and Schwartz are playing "tight" instead of trusting their instincts and chemistry to find each other and create chances.
On the other end of the spectrum, Pietrangelo's been more assertive and engaged in the offensive zone, just as Berglund has picked up his checking and isn't as hesitant to shoot. If they could all find themselves like these two have, we'd be WAY more effective.