After watching the video, I'd say Trouba will be fine to go-- soon. He just got knocked down, and lost his balance getting back up. He got his bell rung, just like a lot of boxers who get knocked down in a fight--but many come back, and win the fight.
He was not laying on the ice like Laine, or other guys that I've seen take a wicked hit. Some of these guys are laying on the ice for 5 minutes.It looks to me like he'll be back in 7- 10 days ( if that) He got up right after he was hit, but lost his balance, but made it to the bench, and walked off thru the tunnel on his own steam-- he'll be fine. My opinion.
I'll agree that in watching the video it doesn't look like much, so why did Trouba react like he did?
It appears this was a chin shot, something the boxers you reference in your post are often on the wrong end of. Your post hints that this is not severe & that boxers routinely get up & return to win fight afterwards. Although this has certainly happened it hasn't been often. I'd suggest you've seen Rocky a few too many times or recent St. Patricks day celebrations have had you listen to Chumpawamba on repeat. Those that get "knocked down" most often "don't get up again" & can't claim "you'll never gonna keep me down."
A chin shot is one of the most damaging punches. The knockout that occurs after landing one creates trauma that is the very definition of what a concussion is.
Displacement of Brain
A fighter who cannot sustain a powerful punch to the jaw and is easily knocked out is said to have no chin or a glass jaw, according to boxing and mixed martial arts trainer Ross Enamait. A knockout punch snaps the head to the back or side and smashes the brain against the skull. The impact may traumatize the brainstem, resulting in loss of motor control. Blood supply to the brain can be cut off.
Force of the Blow
Impact to the brain is determined by the acceleration of the head and how forcefully it is snapped. Any blow to the head can cause a knockout, not just a punch to the jaw. The greater the force, the more quickly the head will turn following impact and the more the brain will be displaced and blood vessels compressed to the point of causing immediate unconsciousness.
Neck & Jaw Muscles
When an opponent is surprised by a blow to the head, his neck and jaw muscles are loose. If he is braced for the impact, a fighter can better absorb the impact of the punch, lessening the force of displacement. Some fighters have more stable jaws due to the anatomy they inherit but strengthening the neck muscles may help better handle impact to the jaw, according to "Fight Magazine" author Mike Chiappetta.
Recovery
In boxing, a technical knockout usually requires 45 days off before a fighter returns to the ring, or he will be more susceptible to another knockout, according to Osric King, sports medicine physician and medical adviser for the New York State Athletic Commission. After a single knockout involving loss of consciousness, there needs to be a recovery period of at least 60 to 90 days. Chronic brain injury is more likely in cases of repeated blows to a boxer's head, according to the British Medical Association.