Even if it is branching timelines, which the death of kellogs grammy might suggest, Old Alec believes that we are dealing with a predestination paradox, and he allowed/forced liberate to happen to make sure that kira showed up in the past beleiing what she beleived so that she would do what she did.
Wormhole... The timemachine was made out of Bicycle rims. If that wasn't a clue, how about when he offered to share his tinfoil hat with kiera.
A tin foil hat.