I've seen the videos, those are all palp leads not traya leads which can crush the new jedi. Also keep in mind the guys who make those videos have everybody geared and leveled to the max. Most dont have the resources to do that right away.
And again I contend it's not OP, every video you're reacting to is a Bastilla lead, you would need a GK lead for jolee to launch a swarm attack and therefore lose all the advantages that come with a Bastilla lead (which is very effective against the sith). So no, having jolee and gk have the synergy they should would not be op. And again there is no valid reason for it to be taken away.