Bristleback + Gyrocopter

Why this works

Trying to land a full Rocket Barrage on a mobile hero highlights the core issue with this pairing. Gyrocopter needs enemies locked down to guarantee his magical burst damage, but Bristleback provides almost no hard control. His Viscous Nasal Goo slows targets down, which helps with chasing, but it doesn't stop them from turning on Gyrocopter or using an escape spell. Similarly, a Homing Missile is easy for the enemy to deal with when there's no stun to set it up. Bristleback wants a messy, extended brawl where he can stack his spells, while Gyrocopter excels at blowing up a target that is held completely still.

In practice, this means your team fights often feel disconnected. Bristleback will run in and create chaos, but the enemy team isn't forced to deal with him. They can often kite away from his slows and reposition to burst the much more fragile Gyrocopter. Without a reliable stun from another teammate to bridge the gap, Gyrocopter is forced to use Call Down on scattered targets and can't focus his damage effectively. The two cores end up playing their own separate games within the same teamfight, rarely enabling each other to secure clean kills.