hahaha
Dealing with the dufus underwater in coz would be fun!!
However, a more gentlemanly or ladylike approach migh be to place a hand on his shoulder and a hand on his lens, and point to the rest of the group hovering behind him, wiggling your finger to draw him away to let the others in for a looksie.
If you are one to get out frustration underwater, which I am not, then consider the following, if a siscussion on the surface does not remedy the situation:
1. Just get upcurrent and allow the current to push you into him to take him out, grabbing onto his BC, as if you are hanging on for dear life, while everyone else stays on station to check out the interesting underwater point of interest. This would be honest, cause you could argue that you are having a hard time staying put in the current waiting for him to get done, and that he seems to be doing a fantabulous job keeping put for hogging all the shots. Why fight the current or hold onto the sand when you can hold onto the dufus?
Topside, you can say, "oops, i am such a girlie man, I cannot handle these tough currents!....SAWRY" You may or may not want to add, "while you are hogging all the underwater sealife."
2. Other ways would be to slap the guy on his leg, and when he turns around, make the shark fin hand signal and point over the edge into the blue abbyss frantically. How fun.
3. That suqs on the wifey playing interference. Next time get the group to plow into her from the current's upstream side. That will take her out of the picture and teach her a lesson about watching her buoyancy and position.
Do this safely of course so as not to physically harm anyone.
4. For added theatrical effect, make a look of shear terror on your face while u do any of these things. You can frighten the Sh'it out of the guy by temporarily taking your reg out and making the look of shear terror with a silent scream. You can even head right for his main reg (not his octo) and at the last minute, pop in your reg. This is if you feel comfortable taking the reg out and suceesfully getting it into your mouth per OW drills you learned. You would have to say you lost your reg and could not locate it or your octo, and that you only have your 5 OW checkout dives under your belt, sawry.
5. The other thing to do would be to ask not to be on the same boat after the first 2-tank dive or ask for a refund so you can go with another dive operator.
Oh well, whatever you do, do it safely and responsibly.