What if Luke and Vader fought Sidious???

So a lot like how the Lego Video game goes....What if Sidious tried to zap luke, but instead Vader deflects it with his lightsaber. Luke then Ignites his too and Luke and Vader stand side by side with their lightsabers ignited. Sidious then ignites his and Luke and Vader vs Sidious happens.

I know Sidious is a beast in the 3rd movie, but he also was much older in this movie.