They are robots, are they not? I'm sure Karate Kid could pull out some sort of Bullshido technique to scramble their circuits.
EDIT: Other than the power of the Plot, though? I doubt even Karate Kid would be able to take on these two, hand to hand. They are way beyond even the Juggernaut in strength, and durability. They are empowered by the M'Krann crystal to be ENTIRELY impervious to harm, are they not?
Considering that he was put out of commission by way of a sonic attack? Doubtful. Apparently, as strong and durable as they are, they still suffer the normal faults of robotics. Circuitry.
Except that they can have their circuitry messed with. With sonic attacks, perhaps, but I'm sure that Karate Kid COULD pull up some bullshido technique to produce a sonic attack.
Jahf got beat like that, yes. But Modt is really just a bigger, badder version of Jahf. He may be a thousand times as powerful, but that doesn't mean that Karate Kid won't be able to make a sonic shockwave that is also a thousand times as powerful.