Luffy is puting himself into trouble now .

Regarding "Shanks"

1. Shanks is actually working for the government and betraying Luffy

2. Shanks is betraying the government and is actually working with Luffy

3. Shanks actually has an evil twin, a theory I didn't want to believe before

It all depends on the "Shanks"'s left half of face, it will confirm or disprove the 3rd possibility.

Oda is purposely hiding the scarred side of Shanks' face to keep people speculating. I think it's great that we are finally seeing some of the Holy Knights