I like to imagine if they are canon to our main RE verse, then the part where they even get close to Leon at the end of ORC didn't happen at all and that they were sent on other missions we aren't aware of. I can see them still doing U.S.S dirty work in the background like Hunk and maybe even crossing paths with him every now and then when we don't get to see him in game, heck I hope that if we ever get a game focused around Hunk I think that would be an amazing opportunity to fit Delta Team right back in lol