I'm glad the question has been settle as it has. I think the article is better, but still needs work on the history (I will try to do that). Although it is not important now, you can also see that these beers are not related here: 
http://www.brauer-bund.de/bierfans/sorten/inhalt.htm That page does list related styles, but clearly Dortmunder and Märzen are not. This page, by the way, is from the Association of German Brewers.

I would like to end on two points: 1. the fact that Mr. Daniels is not aware that these two beers are not related is evidence that he violates WP:RS. I should also point out that this is not an obscure topic, but something anyone who knows about German beer would know. 2. On a personal level, I regret to tell you that I was very insulted by your idea that an American home brewer knows more about my culture than I do. An apology would be appreciated.