I agree with this as a possibility.

My brother believes Bigfoot is in fact a being like that. It explains personal observations with little physical evidence. Worth thinking about anyway.

Hmm, tesseract.  I'll have to look it up.  I never thought of Bigfoot being this.  Very interesting.  He's usually described as a giant too.

 I'd say interdimensional existence , not super-position would be the only way to explain things like Bigfoot considering how accessible modern technology is.

 Definite Bigfoot sightings are reported, people seeing it right in front of their vehicle, no doubt of what they saw.  Except they never happen in cars with recording dash cameras for instance.  On the one's that do record, the raw footage is never available.

 Drone FLIR cameras can see mice in a forest but not Bigfoot.  Bigfoot travels across a guy's property every month, until a series of trail cams are installed.  

 Must be in a different dimension.