LogFAQs > #879380146

God isn't here unfortunately - as he informed. So since I know the roach and it's so important to the match, have a bit of lore on them. This all comes from the short story Acid Burns, which prominently features the Roaches.

First, Roaches are TOUGH:

Brach saw roaches burrowing into the ground, letting the dusty, cracked surface of the moon swallow them up, safe from harm. Some were injured; others burrowed as a preemptive defense. The banshees would need something more powerful than stingers to take out these particular zerg.

tl;dr missiles vs roaches, they score injuries, not kills. However, they are not immune to explosives. See here:

As the marines poured out into the courtyards, C-14 "Impaler" assault rifles armed and ready, the first roach burrowers broke the cracked moon soil inside the walls. The base lit up with gunfire as Lee's troops took the battle to the zerg. The roaches retaliated with acid blasts, and powerful chitinous limbs that ripped one marine in half while she watched. Another fell as a roach erupted from the ground beneath him. She watched him struggle as it dragged him down, and got only a grim satisfaction when earth and carapace showered out of the hole. The marine had set off a grenade as a last resort.

So we know Jim's explosives can probably kill it, but the hit has to be precise. Mega Plasma is up for grabs but I think it can too. But the fight vs Knux is not gonna be close. See, this is what Roaches do against power armor:

The front roach rose up on its front legs and opened its maw, vomiting a stream of acid as Brach landed on the ramp. It hit him above the right knee, knocking him off-balance. He collapsed on his stomach beside Lee, and she watched in horror as his neosteel armor smoked and dissolved before her eyes.

Yeah. Tears through steel like it ain't there. Worse, it's loaded with septic viroids that basically poison the target fatally of the wounded area isn't amputated fast. The roaches are a menace...the catch is, they can't shoot up. In this same story, Banshees (flying terran vehicles) are deployed against them, and the only response the Roaches have is retreat and burrowing. So this match to me is Jim vs the Roach - cause eventually, they'll be the last fighters standing.
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Shine on, you crazy diamond.