Traditionally, I haven't totally loved Kadri's game, and ultimately, there may be a situation where the Leafs sign Tavares and Kadri becomes a casualty of that upgrade.
However, the hit he put on Wingels was not an issue at all. First of all, the sequence of events was basically Chara hitting Marner, and then Wingels coming in like a fake tough guy and elbowing Marner in the face. No harm done at that point, but it's clear there's an attrition game that Boston is playing. Plausible deniability, but there's the intent to f you up as part of the game plan. This is why guys seem to drop like flies when they play against the Bruins, as well as Bruins players themselves.
Kadri stepping in and wrecking Wingels I hope sends the message that the Leafs should be in it together and that liberties taken on our younger and more vulnerable stars won't be taken lightly.