Where to begin with this,... By the OP's description, it sounds like the diver in question could certainly use some remedial work whether he's going tech, staying recreational or whatever. Good buoyancy skills are essential & begin in the OW class & should progress & improve as a diver becomes more experienced comfortable. At 40 dives, he should be coming out of that beginner's "survival mode" we all experience a newly minted divers & at least starting to work his buoyancy control to at least stay off the bottom & not destroy things around him. As for air consumption, good buoyancy & general comfort in the water will dramatically decrease the amount of air consumed. Who's to blame? Instructor? Agency? The diver himself? Hard to say with the information given. As for the equipment he wears, it's his choice (whether a good or bad choice). Getting some opinions, whether from a course, instructor or another skilled diver in that particular field, would seem like the prudent thing to do. Good skills can still be done/ learned whether using tech or Rec gear. Like some posters above, it concerns me that the diver thinks he needs no more training & can get all he needs from the Internet. While yes, you can glean some very useful information form sites such as this one; it must be taken with a grain of salt. There is as much good information as there is bad. What works for one person may not for another; what works for one locale may not in another. The problem is beginners frequently don't know which information is which or how to sort it out. That can make for potentially dangerous situations & possibly even a dangerous diver. It's all in how the information is used. Sure, there are some very talented divers who can filter out the bad info, take the good & learn the skills by themselves, but I would tend to think that these are rather few & far between. With formal training, as most of you know, it is typically done in more controlled environments, that way if there is a problem, it can be quickly corrected by a good & competent instructor, before it turns critical. I am learning this thoroughly, right now as I go through my OW instructor course. In the course, I am learning my short comings. It has been rather sobering, but in a very good & constructive way. I am working on my problems, to eliminate them. I have been diving for 3yrs & have just over 200 dives to date, but with this course, I am seeing that I still have much to learn (not that my basic skills are really all that bad, but they are not at the quality needed to instruct). Too keep learning is to keep fresh & up- to- date (plus I love the challenge, even when it kicks my behind). I am actually going to ask my IT/IC to allow me to intern a while under himself & the other instructors at my LDS, to gain more experience, before allowing me to go on to full OWSI. Unfortunately I really haven't gotten the opportunity to get much "hands on" experience as a Dive Con. I must get the experience somehow, somewhere.
While doing my instructor course, I am also working towards the technical field. I just finished a Cavern/ overhead environment course. I thoroughly enjoyed it! I would like to move on at a later date towards cave,... maybe next year. I have also spent the last 1-1/2 yrs in an Adv. Nitrox course. Why so long? Well,... to be honest, it has taken most of this time to become familiar & comfortable with my technical equipment. I'm not in a huge hurry, though I'd like to get it complete sometime this year, i don't want to go into the course completely green to the equipment & environments I'll most likely be diving. At the start I was not at all in control of my equipment. I looked like a big thing flopping around, sculling with my hands, landing on the bottom.... so on. It was like learning to dive all over again for me. With the help of my instructor & several generous technical divers from our LDS, my skills improved dramatically, just as I did in my dives following OW. Hopefully I will be able to get through the instructor course, intern for a while & then be able to become a quality instructor who wants to turn out quality divers & also finish my Adv. Nitrox class so I can eventually move on to bigger & better things technical- wise.