Dahlia has featured in the last 2 ECC, releases, so I thought I'd do a comparison of both fights. First thing to note, from listening to the lady’s interviews, is that they weren’t released in the order they were filmed.
The latest release, Dahlia vs Alex, was actually the first fight for both girls. And it's hard to say if Dahlia has improved since her debut, because Alex, I think it's fair to say, was a much tougher opponent than Samantha, and every bit as aggressive against Dahlia as she was in her later fights vs Charlie and Marissa.
Of the two fights, I personally enjoyed Dahlia vs Samantha more. That's because I like to see definite submissions in a catfight, and the drawback with Dahlia vs Alex, for me, is that all the submissions in that one are called by John, due to the lady on the recieving end of some very rough treatment being too stubborn to submit herself
But Dahlia/Alex is just as rough and emotional, and has more face slapping than Dahlia/Samantha so some fans will disagree with me on that ... especially fans of Alex.