Atomic Robo/WMG

Dr. Dinosaur is not crazy.
I just want to get it on the record, because apparently he's going to be an arc villain in the future.

I don't think he's insane, I think he enjoys messing with Robo. Not entirely sure what he actually is, but Robo's theory about being a genetic experiment works.

Alternatively, he's not from the lab islands, but is from somewhere else and is looting the islands for whatever nefarious purpose he has. Probably tuning the world into dinosaurs.
 * As Dr. Dinosaur being an arc villain, it was confirmed on this very wiki, under the page discussion. Kurosen is Brian Clevinger.

Dr. Dinosaur's claims are (mostly) legitimate.
Robo's arguments pale when you realize that Robo's world has extra rules of ("imaginary") physics few have figured out yet, as seen with the giant ants and the abomination from beyond time and space. With Robo himself already having traveled in time to some extent, it's entirely possible that Dr. Dinosaur is telling only a slightly fudged version of the truth (IE - he was probably picked up by a human time traveler and then took the credit after he ate him or something).

Jenkins killed the Cosmic Horror.
It meets Tesla once, changes tactics, and comes back. It meets Robo four times, changes tactics each time, learns hate, and comes back.

It meets Jenkins once.

Alternatively, it isn't dead, but refuses to return out of fear of Jenkins. Is there a meaningful difference between a dead cosmic horror from outside reality, and one that refuses to come back?
 * What if it starts bullying other Eldritch Abominations and they attack parts of the universe where Jenkins isn't.
 * Nonsense. Jenkins is everywhere.

Alternatively, Jenkins is an eldritch abomination to the eldritch abominations.

The secrets behind Robo's brain and "heart" will be revealed whenever the series ends.
Volume 1's detail on Robo says that his automatic intelligence and atomic engine are the most mysterious parts of him. It will turn out that Tesla discovered how to create a soul or something, fueling some of the rivalry between Tesla and The Necromancer Edison. More likely, it will be left open to multiple interpretations.

As for his power core?

Dr. Dinosaur is from another dimension.
We know dimensions outside Robo's exist (the Vampire Dimension, the "exoverse", etc.), so what is so impossible about Dr. Dinosaur being from an Earth with some weird properties (the whole crystal thing) and where evolution occurred differently?

Dr. Dinosaur will/has create[d] a Stable Time Loop.
Dr. Dinosaur will try to destroy the Large Hadron Collider on September 19th, 2008. The damage done will cause it go wrong, thus doing whatever it was which brought about the extinction of the dinosaurs (possibly in another dimension, as per the above theory) and the Doctor's enhanced intelligence.

In the Roboverse, the LHC created the "Shadow from Beyond Time".
Not much coherent thinking here, but basically since part of the reason the LHC was made was to recreate the conditions of around the Big Bang, why not accidentally create a sentient universe? Also take into account its meteoroid/meteorite form in 3.3 and the immense heat it was giving off, which could explain some stuff about the K-T extinction event. Eating/intersecting with various creatures could explain why there is no fossil evidence for Dr. Dinosaur's species. Maybe Dr. Dinosaur used the thing's goo (leftover from Robo destroyed it across time, possibly crystallized) in order to tunnel through time or something. One problem is that, according to Charles Fort, the thing only exists in our world starting from 1908, but he could be very completely wrong, of course.

Bonus points considering that Robo and Fort seem to believe that it seeks to eat and unmake the universe and return it to the void it was before its birth. So basically, it wants to fulfill its purpose. ("You wanted to recreate the Big Bang? You got it!")

Rex Cannon "survived".
He seems like the kind of guy that would be able to fight them off, but he was gotten by surprise so it sorta evens out--he held them off long enough that he didn't become 100% vampire yet, but when Bernard did whatever he did with the diamond, the virus (or microbe or whatever creates the vampires) inside Rex was banished to the Vampire Dimension, leaving him as a "half-vampire" of sorts.

Dr. Dinosaur is a time lord.
What someone has to do this WMG,but look at the evidence he admits to having a tardis, even though its played off like a joke, and a couple of times in the classic series its shown that time lords don't have to regenerate in to human looking things (i am pretty sure the master was a snake in something) so whos to say Dr. Dinosaur didn't come to earth get killed by a dinosaur (or well watching Jurassic park) and thus came back as one