Lucky Agent, gets to ride in a minecart with Helena and Ada while Leon is distracted!
I do hope there would be some level changes. On the one hand it would be great if they could have Ada & Agent split up a lot of the time so that other sections of the sub etc. could be explored. Although on the other hand that does kind of defeat the purpose of co-op :/
I guess in Chapter 2 one character could go after the tooth and another after the eye. I doubt Capcom are going to go to the amount of effort required to add alternate areas anyway, which will make a lot of sections awkward given how many narrow corriders etc. there are in her campaign. It could make for some amusing scenes though, like when she's knocked out by Simmons and Leon has to leap down to shield her. Is Agent just going to stand there like "Meh", or will he be up with Helena sniping?
I guess in Chapter 2 one character could go after the tooth and another after the eye.
I doubt even this will be possible. You have to use Ada's grapple to get one of them, and like in the other co-op campaigns (opening a door for example) you have to wait until both characters are ready before you can proceed anywhere. :/
So when you're playing co-op, neither Ada or the agent will be able to hook shot individually, unless they give the agent a hook shoot and the animation for it, which knowing Capcom, is pretty unlikely.
I don't know who's they'll do it, but I do know that the Agent will NOT get to drive his own helicopter in Chapter 5. When you leave the chopper as Ada, you can look that there is a second seat next to the one Ada sits in, it has the aiming device too, so yeah, my guess is Payer 1 drives and shoots but Player 2 only shoots.
My guess is the coop partner will appear next to Ada after grappling and cut scenes and only be usable for fighting. During helicopters scenes the partner will not be on the screen and will watch til on the ground and then appear next to Ada. Just a guess, but I don't see how else they can do it without major reprogramming/rewriting.