Isayama posted a correction on his blog for chapter 89. He meant to write that Eren concluded the he needed to touch a Titan with royal blood as opposed to eating. That clears up so much and makes Eren sound less insane for jumping to such a conclusion with the original text. While mangastream's translation didn't mention the consuming part, it's still incorrect since Eren didn't say that he needs to titanize himself then touch someone with royal blood.Spoiler: show