Can you imagine Tim being Jason's Robin? It would be like Tim's version of hell. A stupid Batman.
These scans show the problem of putting Dick in the cowl. Look at that hair! It's the battiest thing about him. And that's even the second hilariously OTT posing shot of him, both times with his hair whipping around, presumably hypnotizing the bats that are crowning him their master. (You know, I would actually get a kick out of it if part of Dick's little quirks as Batman was an ongoing relationship with the actual bats.) Most people would worry about bats in their hair, but not Dick!
Also, did Tim write that note with a calligraphy pen? Maybe Dick wouldn't look so worried/angry if he had signed it "Your pal, Jimmy Olsen?"
So I guess the 2 down here are 2 out of Jason's 3 brothers? Well, if nothing else he's earned that get out of jail free card.