Thing is though Guy, the sample the OP showed us didn't use that kind of lighting at all, if that is representative of his look then a couple of speedlites on a pole giving up to a 1/8000 (you have to get close up but again for his kind of thing that shouldn't be a problem) is sufficient for when needed and a whole heck of a lot cheaper than fast sync profoto gear. The look of the portraits which he's shows shot with the 'blad are nice but they're very very different to the look of the original pictures (which I prefer, this killing sun dead and blasting strobe thing won't last many more years in portraiture IMO, it's far more suited to fashion). It's a look which suits the MFDB's but personally I far prefer the look of the former stuff.
Not sure I agree with this Ben ... and not just because I happen to shoot MFD ... I also shoot with Sony A900s and a Leica M9 and extremely fast lenses ... the latter with no flash at all. Before that Nikon, and before that Canon.
I do agree that the OPs 35mm stuff is quite appealing and has a certain look. However, no disrespect to the abilities, obvious talent and connection with the subject of the OP, the "look" is getting common based on the proliferation of the same gear used by almost everyone ... my assistant's work is pretty similar with her 5D and 85/1.2 etc.. Keep in mind that I'm speaking about look, not all the other elements that make up a successful shot.
I think some shooters are looking to MFD to differentiate themselves .... employing what I call the Wonder Bra strategy ... "Lift and Separate" :ROTFL:
Shelby became involved in MFD for personal exploration ... and IMO, his work, while not the same look as his A900 shots with fast lenses, has taken him to a new level that is far more involving than his previous work was. It is simply deeper on many levels ... less dependent on superficial impact. I've seen a lot of Shelby's work over the years now, and the ones indelibly burned into my skull are the shots of his children with his RZ and Buff lights. Hell, the guy is just getting going ... can't wait until he's even more versed with the gear.
On the other hand, David S. is exploring the commercial side to see where MFD can take him.
The common element here is that both, while very good photographers, are relatively new to MFD. Trust me, it takes a while for MFD to be an old shoe where you don't have to think about the gear, which I'm sure Guy will confirm. I have almost no distinction between handing my MFD camera and using a 35mm DSLR ... it's just second nature. Then the connection with subject isn't an issue, and I can work the controls of my Hasselblad like a trumpet player without taking my eye from the viewfinder.
Lighting and sync speeds is another subject, and I also disagree that it won't last many more years ... In fact, I believe if one doesn't get with that program, it will be you who is dead in the water in a few years. After all, it is the last bastion to distinguish yourself from the growing herd of shooters that often have as good or better camera than you do, and because of the wide-spread info and instruction on the web, know how to use it.
When I look at the work of my friend Irakly, how his unique content is masterfully lit, I can say for certain that there is no chance in Hell of it becoming a "herd technique" seen on every facebook page in the world.
-Marc
BTW, My 2¢ ...I think shooting Seniors is more like fashion than portraiture anyway.