The Americans don’t need to worry about their penalty kill. Larkin, Matthews, Eichel, and Trochek are all capable of killing penalties and are there for the foreseeable future.
Boldy could probably play the PK effectively too if given the chance. Beniers is another young guy that thrives on the PK.
Part of the problem for the Americans was bringing too many Nelsons, Millers and Kreiders. Their star players are all capable of filling in checking and PK roles. I understand bringing one of those guys, but they should look at Tage, Caufield, Debrincat and Keller for the other spots.