Yeah, Gear Town is the primary element while Skill Drain is more support...especially since Gadgedragon WANTS its effect when it hits the field so you don't need to worry so much about using removal beforehand.

GearDrain uses GDragon x3 just for getting them out when GearTown is destroyed, usually intentionally. They simply are what BEWD is for Hopeless Dragons, a 3000atk beatstick very easily summoned out to play. I don't have a single gadget in my GearDrain, so it will never get its effect anyway...Skill Drain goes well here due to all the other support, especially for getting out Beast Machine King Barbaros Ur with 3800atk that DOES damage and can be summoned very easily.

I know what the Deck is and I mean the m/t locking effect as that is NOT dependent on the Gadgets in any way.