I think the hidden messages were about riku, words riku talking about himself in 3rd person "i need more affection then you"ll know" meaning that hes a person with not much care or affection in the series (what he thinks) and saying "he was ansem, he was ansem" meaning that riku (still talking about himself) was ansem (Kingdom hearts) and ansem controlled him explaining "And it was real, i never knew it" Might mean that he didnt know ansem was completely controlling him. Remember Riku is serious most time and confident, "I need true emotions" "I hate emotions". And the part "I cant close it" Might mean that riku cant close The Door of Darkness himself. He also says "i will destroy them" might be mentioning what he is going to do to his enimies and he also says "So many ups and downs" which could mean his quest or mission to save kairi. Speaking about kairi. he says "We used to laugh, we shall be back" which means about what used to happen at the island when they were kids and how that one day they will come back. (Which they did in the ending of kingdom hearts 2). And "yeah Yeah yeah, i was him" could mean riku became or turned into ansem in kingdom hearts 2. "Namine, im sorry" could be Riku apoligizing to Namine for something her did. Thank you for lisening to my thoughts about the hidden messages in The opening intro Santuary. I saw the video today of the messages and i creeped me out and i felt like my childhood was crushed (Even more) and i realized what it could mean and i wanted to share what i thought. thx
Rodolfo206