One of the big themes I’ve noticed while reading talks about Phillies prospects has been the comparison between Marson and D’Arnaud. Last winter, Keith Law jumped D’Arnaud over Marson, and this winter Kevin Goldstein bumped D’Arnaud above Marson. Baseball America still puts Marson ahead, and the readers here who voted for the top 30 put Marson ahead. So I wanted to take a deeper look….