Thank you so much for your efforts in publishing this in English, I was curious about it's content...my God, couldn't they AT LEAST provide us a more appropriate story with a manga illustrated by Ayami Kojima included?
I don't like them mixing with the supreme original SOTN content..it was a masterpiece, just let it be if they can't live up to the earlier standards!
(why would Alucard have any problem in defeating Magnus..or any opponent at all generally? he's the most powerful character in the series, the only one who could slay any opponent in just a few seconds..(2xring of varda+crissaegrim or Alucard sword+Alucard Shield+LVL 99=D...)
I think the focus of this radio drama is on Alucard's inner struggle to overcome his other vampire half & his bloodlust - which is more of a spiritual/ mental battle. In terms of physical combat, Magnus probably knows he isn't a match for Alucard, but his aim was to tempt Alucard into succumbing to the dark side through his magic and his words. Moreover, SotN introduced him as an enigmatic centuries-old dhampir... don't we want to find out about his sordid past?

If the script focused on physical fighting, then radio drama would not be a suitable medium to portray it. They might as well make another game. Like you, I'm also wondering why they chose to do this, rather than a manga by Ayami Kojima (budget problems, perhaps?)
Castlevania seems to make weird decisions when lending itself to derivative works. Stuff like the Belmont Legacy and that canceled Castlevania III adaption were polar opposites from what was currently the direction that the game took. I mean, just compare Warren Ellis' goat abuse and Portrait's slap slap kiss interaction between the two lead characters. Can you imagine that being part of the same series?
It seems like Castlevania is trying to pander to too many types of fans....hahaha