hmm interesting, i had no doubt in my mind the blood mike had on him was either one of the drops that got sprayed when gus gave dude the boxcutter treatment, or he got it on him when he helped move dudes body. but i went back and checked out both scenes, in the boxcutter scene he is wearing all black, in the bar scene his shirt is tan/beige/brown or whatever.
i never even thought at all that mike could have possibly killed gus, but going back and re-watching the second episode when mike says "You're never going to see Gus again Walter." the way he says it gave me a hmm... i had to remember though that it was admitted gus and walt have a show down in episode 12. i think its far far more likely that mike killed saul... after all, sauls commercial comes on while mike is in the bar...... and saul has been helping walt and jesse. either saul or his bodyguard or the guy who sold walt the gun
lol you guys are throwing all kinds of theories in my mind. i also had no doubt at all that it was mike that called walt outside of gus's house, but now im positive it was the new guy
i cant wait for the next episode