That was the counterplay on Paper, but that did not actually work in game. Your lead didn't matter when yi or Udyr left jungle with a fully stacked Flare.
You also couldn't counter jungle them because the item, before it was even stacked, was amazing for dueling and a lot of the champs that took it were awesome duelists like Xin or Udyr. So that option was off the table.
The active jungler thing was just dumb because you would need a monster lead and if your lee sin didnt provide it for whatever reason, or couldn't you auto lost the game.
and yeah good joke on the grouping one, im Plat 2 RN and can still barely get my team to group and take objectives so this one gave me a good laugh.
There was like a 3 week period where every single Flare abuser had a 54% or better win rate and Udyr and Warwick were sitting at close to 60%
The item was clearly broken