I really loved kid thor and wish that they would of went much further into his complete story and the story with his hammer and past users,like why was he chosen instead of to huge Viking brothers.

Another thing I am callin B-S on is the fact that robots Rex's suit/automatons was able to be crushed in his hand the hammer was made for and used by thor a god it was even enchanted by the gods, it did make a huge explosion when it was destroyed. Maybe Rex had the suits blessed or enchanted or maybe volcanic ash metal is its weakness.

not sure if you are asking something or made a clever discovery , either invincible is getting good...