Instagib?
If I'm playing instagib, with godlike bots, I wanna be on even ground with them, and I'd use a funbot. I don't even like instagib. You have a point though NeoNite. Any godlike bot 1v1 would be easier then multiple godlike bots in DM. I recently started the campeign on godlike for the first time, and well, one of my biggest probs so far is the bots fraggin each other too fast.
As far as Xan vs Xaero goes, on each of their own home maps, Xaero owns, 'cause he has a rail gun. No sniper on Hyperblast. Also, Xan has to deal with the asmd, which AI never fully adjusts to. To easy to combo Xan around corners, whereas Xaero could only be damaged like that by splash from rockets, or BFG, and if you can get the BFG against Xaero on Nightmare, and hold it for more then a couple frags, you are console cheating, or a better man then I.
Sometimes, even if I console cheat he knocks me off the side, and I never bother to fly. Boy was that embarassing.
I love it when Xaero knocks you off the side with something, then rails you before you hit the wrong place... It's all about Xaero's arsenal.