ORIGINAL: Aurorus
For players with significant experience, however, I do think that veteran Japanese players should refrain from "skipping steps" in research in PDU:on. Substituting the first models of Tony and Tojo for the Oscar IIa in itself is not completely "game-breaking," but deploying 1945 airframes, like the Ki-100, in 1943 can be.
The Ki100 isn't a wonder plane, and researching it early, and skipping all the other Tonies doesn't break the game, not even close. Japan is actually worse off diluting their r&d into this plane unless it is pdu off.
Frank can easily be gotten in June of 1943, and even in PDU off can field 4 Sentai immediately, and 7 with a little bit of r&d into Oscar & Tojo Line. Jacks and George can be fielded even earlier, and all three are far superior to the Tony 100i and 100ii.