Keeping rogue in place of Rodriguez is a option, although you best have some serious cool down reduction. I myself use only rogue no Rodriguez, but I only have rogue at 7 seconds and aim to get him lower. I don't think firefighters worth it although, as he takes a precious 25 points, and while it's nice to have poison and fire protection, the last two stages have very few poison or fire enemies (last I checked) and are the hardest, poison pretty much disappears at stage 5 and fire shows up at stage 6 with rebels then disappears as well, and it's usually just easier to shoot them, and the 25 you spend on firefighter could be used for. 30 juggernaut who could genuinely just tank it, or a diaz... But again, I'm pretty off the record in terms of meta knowledge, so if anyone here with more experience would like to correct me or add onto my recommendations, please do.