I think though the big bounce theory doesn't necessitate a creation from nothing, the original big bang proposition of LeMaitre does.
"The empirical origination described by t=0 in Big Bang cosmology tends to confirm what is entailed by theological core theory, '
creatio ex nihilo means ontological origination.'" (Russell, p. 309)
http://www.nd.edu/~afreddos/courses/43150/carroll2.htm