I watched the game 1 and OG was raped badly though they have a very good engagement during the clash at the early game. But as the game goes by, on the mid-game it's already a turn over for them.

Their heroes aren't effective during the clash, they don't have that much AoE while the line up for Gambit does have a full skills of AoE and they can easily counter if OG wants to engage. GGWP Gambit.