With exploration reels the emphasis is on deployment, and not usually on winding the line back up again. We tend to put on as much line as possible, out to the limits of the spool. A little duct tape around a full reel is added security that the line will stay put on the ride in. Imagine how infuriating it would be to spend weeks planning and setting up a dive, and upon reaching the end of the line find your reel is a giant birds nest. No way we're going to take a chance on that. (We also bring at least one more exploration reel than we think we'll use.)
Stages and drive bottles do indeed go on the left. They are used on the left, and they are transported on the left. However, now and then we'll clip something off on the right temporarily. I do this a lot when I get back to deco and I'm waiting for the deep greet team to show up... I'll sort through all the bottles and scooters I'm carrying, leave the stuff I want to keep in the normal position on the left, and transfer the stuff I want to get rid of to one or more loops on the right. Then, when support arrives, there's no time wasted... just reach back, hand off all that crap, and relax. The picture you guys are looking at is somewhere in the first 20ft, as one of the breather divers is inbound. He's just got his bottom gas (which is not in use) clipped off there temporarily, my guess is he moved them simply because he got them hung up going through the hydrilla jungle near the beach. We'll usually rally at the habitats (at 30ft) on the way in to make sure all gear is squared away before heading down to the 190 drop, which is where we'll switch to the bottom gas and "start the dive".