Destroy his machine and he won't be able to win 

Well, the reason that side#2 take the least damage is that the monster is too focused on the lead char in front row so they get less focus on the side#2.
I was trying to explain this in-game but well lol 
And yes, you can switch the char around.

Ok. Here is some updated info about mah battle engine:
after lotsa redesigning battle screen, this is what I ended up at


Front row will attack slightly stronger, but will take slightly more dmg/get hit more frequently
Side row 1 will do normal attack and defence
Side row 2 will do slightly less attack but get hit less often/less dmg taken
Couldn't upload the pic at the moment
Also, Top left, Top Right, and Left bottom spaces are "Lead" chars.
If all 3 of them faint, you lose the battle.

Ultralisk can step them over I think

I think there is always WoW Free Trial in every Blizzard games...(Diablo II, SC, SCII)....

1294: You strongly believe that ur calc will save the world from 2012 apocolypse
1295: Your calc can divide by 0 and not get error.

I think I heard that they won't bring lurker back except for campaign purpose only

When I use carrior, I make sure I get a lot of hallucination Voids so they will attack them first while carrior pwn them.