Im not here to submit a full theory but rather to point out an issue
pertaining to the bloody word written on the wall in the Mexican Motel.
Why is everyone assuming that it is 'He is Man...'.

Have you considered that the least letter might easily be an 'm' or an 'r'??and that the dying man was not able to completely form this last letter.

Do you agree? and in this case, what can the sentence truly be?