[A Dog's Life] hasn't a CLUE what alpha behaviour is - I suspect that he/she is a macho idiot. He acts exactly like an uppity beta. And he's SUCH an expert trainer that he writes "Half of the walk is spent healing at my side" - I'd rather a dog didn't NEED to heal, let alone have to do it while out walking. He can't even tell the difference between your "alpha rolls" and his "alpha role"!
The term "alpha roll" is due to a misconception. Only macho idiots even USE the term nowadays.
It's origin is the inguinal presentation that a subordinate pooch does to appease a superior that it has offended. It consists of VOLUNTARILY rolling 3/4s onto its back and raising a leg or two to expose its belly & throat. It often - especially with pups - includes "paying tribute" by producing a tiny dribble of urine. The alpha then sniffs, possibly urinates on or beside the inferior, kicks a bit of dirt around, and walks confidently away. The subordinate wisely stays there until it is QUITE sure that the alpha has departed.
Whereas the macho idiot thinks that forcibly hurling a pooch onto its back and demonstrating greater strength is achieving the same thing! Idiots, idiots, idiots! Only weak-natured pooches endure it. A strong natured dog punishes the idiot - after all, the idiot has put himself off-balance by leaning over & bending down; and even standing erect no human can react faster than a dog can! You'll find plenty of macho idiots with serious bite-marks! My only regret is what happens to their dogs afterwards.
The members of my group who use GSDs to look after their sheep wouldn't DREAM of attempting to force an alpha roll - but Nicky (who belonged to one of them until he died) was mentally strong enough to stop a bulldozer that attempted to cross the day's boundary patrol line, and sneaky enough on another occasion to train a kids' baseball team to have some run the patrol line for him, others pat him, and some to bring him bowls of water.
The members of my group who use GSDs for S&R work wouldn't DREAM of attempting to force an alpha roll.
The Queen in my group, who has several times represented the USofA in the World SchutzHund championships and been the team's captain, wouldn't DREAM of attempting to force an alpha roll.
Get the picture?
It is a voluntary thing done by one dog for another dog.
Or it is a stupidly dangerous thing attempted by macho idiots.
BTW - some of my bitches mimic an alpha roll to tell me they WOULD like their chest rubbed. They also reckon they have got me well-trained to supply them tidbits of cheese, canned salmon, canned beetroot, meat-paste, peanut butter, KFC bones, fried chips when they sit ostentatiously.
I've never attempted to play with their food. But any dog that dares take the meat I've given to its neighbour gets hounded into a corner and that stolen food taken off it and returned to its rightful eater. And when a rib bone gets caught across the roof of a dog's mouth, jammed between its P4s, I have no trouble whatsoever opening its mouth and levering the bone out - my dogs KNOW that what I do is for their own good.
I don't need to try to PROVE that I am the alpha - my dogs just KNOW that I am because of my calmness & consistency & fairness.
[Thought]:
Update your terminology. Most of the examples you gave are of uppity betas, not alphas. An alpha is a NATURAL leader. An uppity beta is one who bullies others. I once had a bit.ch come back for a spot of manners training. She made the mistake of snapping at my true alpha bit.ch - and was terrorised all the way down the hill and into her kennel, without a drop of blood being spilled.
In the army, alphas DON'T get killed by their own troops, but uppity betas DO, whenever one of the troops thinks he can get away with it.
Les P, owner of GSD_Friendly: http://pets.groups.yahoo.com/group/GSD_Friendly
"In GSDs" as of 1967