Japanese fighters didn't have much in the way of fuel at that time. The fighters teeth were pulled, with the only aircraft being fueled were kamakazi. Not a lot of repeat missions there.
Again, all this was unsure. It was a conservative thing to take Iwo. We hadn't been that conservative, because we couldn't be. After the defeat of Germany, we got more conservative.
No, but those kamikazes aircraft were the most dangerous that the U.S. ever faced in open battle.
At Okinawa alone, kamikazes sank 21 American warships, badly damaged 66 others and killed 5,000 Allied personnel.
Which puts the headlines we see today in perspective: