In true Shonen manga fashion, the baddy that the MC beats in a fight becomes their teeth-clenched ally later on...and we will mock them relentlessly for that.
The big burly dude that was slated for the chief's position if not for Mr. Wizard of the new stone age finds himself on a treasure-acquiring team in a perilous cavern, and he not only saves the main character, but finds himself enjoying the funny lil tasks that is required of him.
...
Being a Godzilla fan, I should understand, but I don't.
WHAT'S THE CONNECTION BETWEEN GODZILLA AND TUNGSTEN? WHY DO THEY KEEP SHOWING EM TOGETHER IN IMAGINE PANELS? IS IT BECAUSE OF THE GLOWING BLUE THING? WHAT?!
...
Regardless, with rare materials acquired, a rudimentary auditory communication device is made!
But what's fascinating is that there was another hidden message that astronaut dad left for his son...and from that, the science guy & professional liar hatch a plan that could potentially stop the war before any blood needs to be shed!
As much as I hate the ham-fisted way the characters force their catchphrases at us, I really do feel Senku's now: GET EXCITED! 
THE BIG CONFLICT IS ON THE HORIZON!