Yes, chances are that is true. Why didn't Sean think that far, this was a ploy, and a ploy that Sean didn't know at all. Nicholas, yes… Nicholas has something he is trying to hide, either Nicholas is being used or he is the one, either or Nicholas is completely oblivious or he is just pretending to have forgotten his memory, that's what is happening right now.
"You, investigate and search all the forests that are there. Find Nick's clothes if they really exist. I will never let things get worse, I have to find evidence and convince everyone that what I see is the truth, not a thing that will never be possible, I have to prove that Nick has something to hide," said Sean with complete confidence. While Marvin could only be silent, how could he not, he was also confused by all the things that had happened.
