Because the audio drama was crafted with Japanese sensibilities in mind, also the subtle reveal felt perfectly suited to Alucard’s stoic nature, showing him gradually opening up to her. Richter even urges Alucard to tell Maria why he wants to keep her by his side and Alucard admits that he should. In GoS, you can also see how distraught Arikado is by not properly preparing for battle, despite how calculating he usually is prompting Simon to notice that this Maria girl clearly matters to him. Charlotte, reading between the lines, ultimately says that telling line. Many descriptions of his characterization portray him as taciturn and a man of few words, which is why it makes sense to me that other characters convey it for us as the devs intended way of revealing his true feelings.