As far as your fifth point, they might have messed up explaining the concept. In Portuguese, starting a sentence with "E se...?" (And if...?) is the same as saying "What if...?" in English. In the link to the comments section you provided, only one person (Paulenrique) gets it right, though he doesn't explain why.

- "[E] se nós nos encontrássemos mais vezes?"

- "What if we met each other more?" (ie, what if we saw each other more often?)