But! this is a story where someone was the clone of their own son, we see pretty clearly the chicken can come before the egg, besides the egg, or down the street from the egg if it wants to in this series.

Still, personally I think FWR is a fragment of the real FWR. Yes him coming from Watanuki or Syaoran still lets him be a direct descendant of Clow, but it being someone from Clow and Yuuko's time seems a better fit.