That's pretty much what I read. They had a lot committed, and they lost most of them. What they had leftover were eventually used for suicide runs.
As for the B7A2...
Did a bit of checking. They only were in 2 places. So I was checking to see the dates they were there, might give clues to the action they saw.
Only 2 groups had them: 752nd and Yokosuka Kokutais.
The 752nd only received them after 1945 had started, from what I can gather on the Internet. Before that they flew Betties and other planes.
Yokosuka is an airbase in Japan. It mostly had Raidens and Georges and whatnot to try intercepting the B-29 raids. In 1945 if you were an attack bomber stationed on the Japanese homeland, you tell ME what the chances are that they saw non-kamikaze action?
I'd be interested to learn a bit about 752 Kokutai history, though, see if any of them saw action.