I think the thing you want to take away from Peter Hurley is found in his longer videos (like the 1-hour one
B&H had him do) and in his experiences in photographing, and posing. There's a great temptation to think that the lights of an expert headshot shooter will bring to you some of the magic that the top pro extracts from them, but keep in mind that photographing people is more about the "soft skills" than about the hardware.
His philosophy on continuous lighting versus electronic flash lighting is a critical part of the way he poses, and directs, and gives feedback to his sitters. Continuous lighting is...always on...strobes are...very specifically ready, then you have to wait for recycle...strobes POP! and are perhaps cumulatively tiring for many people...continuous lights are just...on...
I do not think that speedlights give very good headshot/portrait lighting, because I want to see the COLOR or the eye,and I do not want that Holstein cow look, with big, dark, widely-dialated pupils, and no eye color...I think the best portrait,beauty,and fashion work shows the iris of the eye small, with a large, well-colored eye...I think 250-Watt modeling lamps in pro-level flash heads give the best results, because the subject's pupils are constricted, and thus have more eye color...a widely-dialated, big, black eyeball looks like ****, and that's what much speedlight work looks like to me, on headshots or portraits.
SO.....BRIGHT lights cause the subjects pupils to constrict, and they can also give interesting catchlights on the eyeball's surface curvatures.
Hurly's got some very valuable tips in his videos. tips on directing,and posing, and to a lesser extent, on lighting. I dunno...I worked in some busy studios in the late 1980's...the skill in much,much,much more in how you relate to people and how you command the session and how you direct,coax,cajole,elicit expressions and synthetic emotions from people when they are in front of the camera.
There's also the tripod-mounted camera versus hand-held dichotomy and how that affect s the session.
Anyway...watch his videos, read his book...but don't drop $5,500 on those lights thinking that _those things_ have anything to do with the results you'd be able to achieve, because it's not about the hardware nearly as much as it is the interpersonal skills and your own knowledge of how to light people. YES, there is indeed some influence attributable to the type of lighting and the type of modifiers being used in a session, but the real success comes from refining the soft skills, the posing, the banter, the positive reinforcement, the timing, the non-gear-related aspects.