does anyone have any thoughts on how sammy and leo valdez have so many things in common???

A most suitable reasoning would be bcose they are both related like Sammy is Leo's ultra-great-grandfather or sthing

i think they are the same person. I think Gaia captured Sammy after Hazel left. I think she perserved Sammy and wipped his memory, creating new ones. making him Leo!!!

either he is leo's father or grandfather or he is the same person and something similar happened to him like it did to bianca and nico

Maybe they are related...but I think Leo could have been in the lotus hotel or something. Or maybe he died like hazel. And then gaea took his memory so he doesn't remember it

There can only be one answer, most likely he is a strange illusion that has been inserted into Rick's mind, causing him to write Sammy as Leo, and the world may just, JUST, have a minor case of being completely destroyed. Or he's a descendant.

Way if Sammy was Leo great grandpa whatever and he died then later on he was reborn as Leo (of course *rolls eyes*) who happens to be a half blood. So that way both could have existed yet not know each other because all evidence has been destroyed except for the soul. That's what I think.

either leo came back from the underworld or he is related to sammy valdez

I think that I read somewhere that Sammy was Leo's grandfather. I'm not sure if it was just a fanfiction or if it was real. But I think its real.

i think leo is sammy so here are all my thoughts
1.i think that sammy already had fire power but didnt tell hazle becase she would think he was a freak (but didnt know he was a demigod)
2. i think after hazle left he joined the army but died (thats how i think he got his "favorit" war jacket)
3. i think herra brought him back from the underworld becase she knew she needed him for the next big prediction for the fate of the world
4. she gave him a fake memory and name untill he would see hazle agian so that is what i think happened