I am not sure where this erroneous presumption was conceived. I DO support Dark Pit, I thought that that much was blatantly obvious. I supported Dark Pit before that leak was actualized, as I did with Dr. Mario. I started supporting those characters after Sakurai asserted...
However, even though Lucina shares her physical stats and techniques with Marth, the characteristics of their attacks differ. When two such similar characters function in an even slightly different manner, I give them a separate spot on the roster since that will affect battle records and whatnot. In that sense, you could say she was very lucky to join the fray!
Trust me, I do not copy and paste this quote for my health.