Well that's not true at all.
Landeskog, Mackinnon, Rantanen, Soderberg
Johnson, Barrie, Zadorov
And Varlamov.
That's the only players from that team 2 years ago still on the team. The rest either joined very late in that year(Jost/Compher/Andrighetto) or have joined the team since then(Kerfoot, Calvert, Girard, etc.)
And even including the guys who were on that team 2 years ago, Johnson missed almost half the season with injury. Varlamov missed almost the entire season. Landeskog missed 20+ games. And Rantanen was a rookie.
We're nowhere close to that team from 2 years ago.