Originally posted by: HumblePie
In comes the story of Terminator Salvation, in which skynet tries to make a "human" machine. The problem with other terminators, even the T800 "Arnold" one, is that they are still ALL MACHINE. sometimes it can get close enough to take out what it needs to, but usually humans figure it out a terminator is not a human. So skynet starts collecting humans and human bodies to make the best infiltration system. The problem is, to make one the mind would have to remain human to act human. By leaving Marcus with his own mind skynet has very little control over him, although it thinks the chip it implants in his head will provide the control it needs. All the chip does is give him "urges" because the human brain is still to much for even skynet to figure out at this point for total control.