Satoru and Tooru are definitely connected, which has been hinted at before. It seems likely they're related which would make sense because previous parts have shown that family Stand users can feel a presence between them and can share senses/sensations. However this is direct knowledge being...
1. REEEEEALLY fucking stupid of that guy to attack Rokudou knowing full well how dangerous Ranna is and what she's capable of. I'm guessing he accounted for Rokudou to reign her in, but still pretty foolish to think that way in front of a person with actual monstrous power.
2. It's equally if...