Kobe isn't going to get in foul trouble, no matter how many fouls he actually commits. He's a superstar playing in Game 7; it's not happening.
As for Rondo, I agree that he needs to attack the defense. However, he needs to attack smartly. That means that he needs to attack to create opportunities for teammates, as much as for himself. He can't go throwing up off-balance bank shots again that miss the hoop by four feet.