...I may be overthinking my little brother's toy choices...

So here's the thing... My little brother is four years old now and he loves dinosaurs. But I've noticed something that's bugging me a lot lately... He keeps asking for toys and games with only T-Rexes or Triceratops on them... Not Stegosaurus, not Velociraptor, nothing else but those two big boys... And I've been wondering if there's some kind of psychological profiling going on in my head? Am I overthinking this like a conspiracy theorist? Or is it just that those are the most popular dinos at the moment and he sees them everywhere... But what if subconsciously, or maybe consciously, I'm worried about him liking mean-looking T-Rexes all the time? And his toy Triceratops seems to be more of a defensive fighter type, you know? Like am I projecting my own anxieties onto him because he's still young and doesn't fully understand these things yet... Or is this just another one of those overanalyzed parenting moments that everyone has at some point...?