Regarding the Jarvis selection, it's easy to see why he was named over potentially superior players like Bedard, Scheifele, etc to be the extra forward. He can seamlessly fill in for anyone that gets injured, whether top or bottom 6, and can play on the PK as well. A Bedard/Scheifele wouldn't fill in the role of a Bennett/Cirelli/Hagel if one of them went down.
Not saying it's the direction I would have gone, but not hard to see the rationale.
Basically the same reason the US took Nelson. Though I think he’s underrated. He was already a 30-30 guy while being strong defensively last year while playing through a shoulder injury. He might come close to PPG this year.