You don't understand WP:G5. "Pages created by banned or blocked users in violation of their ban or block, and which have no substantial edits by others." It doesn't matter that Melborn the editor who created the article hasn't been blocked yet. There is clear evidence he is Ryan kirkpatrick. A administrator, The Bushranger most usually, would have CSD the article as a Giant Duck, then started the Sockpuppet investigation afterwards to confirm this was another one of Ryan's socks. With sockpuppets an administrator doesn't have to confirm before deleting in obvious cases. Just look at this one case. I'm going to note this talk we're having on The Bushranger's talk page so he can explain G5 better to you. 

You could put the G5 tag back on it if you want and let an administrator decide the matter. That's up to you. Cheers!