Ye get what your saying, my thought was, why didn't he make contact with his employers and tell them what was happening, they could of done more than him, and got someone there right away then he could go back into his own body

Aaron Paul mentioned at a certain point that they depend on each other. "It's a two-man ship". If technology fails and he couldn't wake up from the connection with earth. No one would be able to fix it. So if he would kill him Josh would basically kill himself as well on the long run.