Gorgon went untouched by Electra on at least 1 occassion. He did the same with Wolverine on at least 1 occassion. Gorgon blocks bullets from a machine gun with his narrow sword. Talk about skill and speed. Now that his agility, skill and speed are no longer in question, let's move onto his durability.
He took completely submerged claws into his chest without pausing, same for Wolverine slashing him across his gut and chest. He took the blast of a missile without flinching. He's undead... and seems to heal fast as hell on top of that. The fact that he's undead probably means he doesn't even have pressure points or need his heart to beat.
So, Slade is not going to out skill him, out last him, or out anything him. Besides, if he wanted to make it even less fair he could just take off his sunglasses. Slade would be stone for eternity.