I agree, I dont think Ink/Guy in the Pinstripe Suit is creating them. As mentioned above, he had issues with a simple numbered keypad. Granted he got it to work, but it took a few tries... this isnt someone/thing capable of complex genetic manipulation. Also, another hole in that theory is, are we to assume that he started in Hawaii and then caught the flight back to LAX and started it there as well? He may be the Yogi Bear of Zombies [smarter than the average zombie] but hes not able to be in multiple places at the same time. PLUS theres the theory that the zombie in the pinstripe suit is the mass murderer they mentioned on the TiVO clip they watched, "Ink". He went from homicidal maniac to geneticist/scientist AFTER becoming a zombie?