I honestly can't see any reason why not including test would somehow hinder the gains you keep post-cycle. Once you're in post-cycle, nearly all synthetic hormones should be flushed out. There isn't a homeopathic effect or anything; whether that hormone was trenbolone, testosterone, or superdrol is largely irrelevant at that point. The main factors that determine how much you retain is (a) your current body composition and (b) your pct. Furthermore there are some pretty potent orals out there that will be just as effective, if not more, at making muscle as most injectables.