>>Also, I don't understand how or when he got off the island
>in
>>the first place.
>
>and why do you think he ever got off the island in the 2 years
>he was there?

I think he's referring to the opening. How did Leo get on the boat headed to the island?

I think if you view that scene as one that actually happened (not a delusion), then it was just the initial "scene" of the big role play experiment. They drug him, and he wakes up on the ferry headed over, throws up as he goes through his meds withdrawal, and meets his partner for the first time.

Or you could interpret the role-playing experiment as much more limited--clearly not everything we see (the storm, the climb down the cliffs) actually happen. Maybe they just give Leo bits and pieces of role playing this stuff and he fills in the rest in his head.

Either way, there's no literal getting off the island for him.