I think the Leipsic-Gagner comparison is a good one, here is why.
In his small sample size he score all 9 points in 6 games against non-playoff teams- NYR, NYI, Arizona, Chicago, Edmonton.
He went -8 with 0 points against playoff teams- Nashville Minnisota, Vegas, LA, Anahiem,San Jose
His -3 in 14 games pro-rates to -16.5 in 77 games similar to Gagners -18 in 74 games.
These are not the fancy stats but the olds school ones less favored lately, but they point in the direction the Leipsic can be a star against bad opponents and a no-show against good ones. I hope he improves.