The tactic that I suggested requires that they team fight as a unit, and in the video it was clear that they weren't fighting as a unit, hence the missed opportunities to take someone's back and choke them out.
As far as "It's safe to assume that you didn't come up with it before them." That has no bearing. The same tactic of isolating the enemy from a group has been around since ancient times. Romans did it, Greeks did it, Egyptians did it, Chinese did it, Japanese did it. Africans did it. Name any large ancient military and you'll see the same tactic. This is one of the main benefits that ancient soldiers would march and fight in tight formation. The tactic is a historical tactic The romans rose to power because they fought as a unit and not just a bunch of guys trying to go 1 vs 1.
Read some ancient military tactics and you'll see the same tactics that I I'm referring to. 5 vs 5 is simple in comparison. If you and I are on the same team, then I will position myself where I can take your opponents back. After I attack your opponent, you then pick up my opponent. If my opponent is too focus on saving his teammate from being choked out by me, then you'll have an opportunity to take my opponent's back while I'm choking out your opponent.
The same concepts tactics and strategies that were used back then are used today.
Here's an example of isolation. It's a larger scale but the strategy is the same. If you are against a group, isolate one of your opponents and quickly take them down.
Like I stated. The only way my tactics would work is if the team is fighting as a unit. Fighting 1 vs 1 increases the risk of being isolated and defeated. Fighting as a unit utilizes your teammates to take advantage of easy opportunities.