I have noticed that, though I haven't seen much Babylon 5, not getting to see TV that often (usually in motel rooms when travelling). I don't mind, since the Elric reference is clearly straight homage, and I'd do the same myself in the circumstances. It stops a long way short of being plagiarism, which I tend to pursue with my big black sword! Also when you've been around as long as I have and done as much work, you have to get used to your ideas becoming standard generic tropes. It means I have to work harder all the time, of course, to come up with stuff which no longer uses tropes I regard as my own (law, chaos, balance, say -- the multiverse, as such, and so on) and this is probably good for me, too!
Terry Pratchett made a good point when he said generic fiction is a big pot -- you take some out and, if you're any good, you put some in. I like to feel I've put my fair share in!