NightwingDayZero
Truth, justice and the American way.
I did a write up on the GL matchup on the page before this.
The long and the short of it is: You outozone him from full screen, so NW wants to stay there. Ground sparks will shut down all of his zoning. When he starts walking forward and going for air rocket, NW can cancel ground spark and dash forward under them for a full punish. Everywhere besides full screen though, GL has the advantage on NW, so the matchup is about being at the right distance from GL at all times.
I still believe that GL should not be losing this MU. There are simply entirely too many things working in his favor.