Ki-84-Ic was not produced in numbers (less than 10 for sure, possibly less than 5) and did not see combat. Ki-84-Ib was produced in numbers, between 275 and 500, and likely saw combat.
The #1, #2, and #3 most important Japanese bombers are already in AH (G4M, Ki-67, B5N). 
I don't quite agree that those were the most important, but they can sub pretty well for the others. A D4Y and B6N would be nice though.