Yes, NYR has been much more successful developing middle 6 forwards than stars at that position.
That's part of why we kept going outside the org (Nash, Gaborik, Richards, Jagr, MSL) to get top end talent. The argument at that point from the more cynical people here was that you can't build a team full of good role players and then just plug UFA/trade stars into the top offensive roles and see success.
But that's kind of exactly what we just did again when we went out and signed Panarin, traded for Trouba, and gave Zibanejad his extension.