But it made me wonder more about what Tarantula was thinking instead of Devin Grayson.
Oh, me too. I didn't mean to imply that I read that scene wondering what DG was getting out of it. I just meant that taking a step back when the whole story is over I think the scene raises huge questions in terms of what a lot of people were thinking. DG's might be interesting too--it was a very unusual choice to include the scene, which basically take Dick at his lowest point and then has him go even lower by having him get sexually assaulted when he was vulnerable.
It's true that Blockbuster was the one literally fucking up his life, but I feel like Tarantula was there to support him in doing it in a meta sense. I mean, Dick being targetted by Blockbuster would have been bad enough but it seems like having Tarantula there did make it worse. When it's all over his main problem seems to be Blockbuster's death. At the end Tarantula got rid of Blockbuster and inserted herself-literally-as the person violating him.