a) The Time Matrix does not create infinite possible outcomes. It alters one outcome of the timeline while protecting those using it. Because of that protection, it doesn't need to create other outcomes.
b) The Time Matrix cannot be affected by physical means, and it cannot be duplicated.
c) As was stated earlier, that could be a possibility, but the Revenant would need some sort of other major significance that it doesn't seem to have currently...
d) XWA-RP has no available moderators.