Bishop73

Answer: No, he got the ability to reset time from the aliens. They are dead now so the ability won't work anymore.

lionhead

Answer: It depends on how you view the reset power. When he and Rita have the Alpha's blood in them, they had the power to reset the day when they died, but that power wasn't their own. It was the Omega that was resetting the day, which it did whenever an Alpha died. But now that the Omega is dead, there's no reset power, so when Cage does die, even with the Alpha's blood in him, he won't return to the past. Now if somehow having the Alpha blood resets the day for Cage, even with the Omega's death, all he'd have to do is get a blood transfusion again and he'll lose the ability to reset.

Bishop73

Chosen answer: First it should be noted that this film is based on the Japanese novel "All You Need is Kill" by Hiroshi Sakurazaka, which is where the term "mimics" comes from and could be something lost in translation (they adapted to alien planet environments by mimicking the biology of the planet's life, not necessarily making themselves look like a certain species). However, in the film itself it, was said the aliens "mimic our every action", militarily speaking. This is of course because the aliens were resetting the timeline when an alpha died and knew what the military would do, but to the military (and news reporters) it looked like they were just copying our fighting style.

Bishop73