I do In general agree Karnak, howeaver I must say this:
Politics, the fleshing out of the Pearl harbor plane set is good for the CM's, we all saw Tora Tora Tora, and Mate Damon was just so cute in the pos movie Pearl harbor, the setting is a popular one, and those three planes the Val the Kate and the A6M2 were the primary tools with which the Japanese Navy wreaked it's destruction in the early part of the war in the Pac.
Pyro: In his defense he was damned no mater what plane he chose for Japan, that is If he only chose one to add this patch, their may be more. He did do somthing by chusing this plane he filled the Early war Japanese CV planeset, and made it possable for the CM's to do a number of events that represent with far more imershion battles that are very prevelent in the American psychie.
Personal: I fear we may be stuck with the Kate, what I mean by this that we may not see the Jill, or the Grace, since we alread have a Japanese torp bomber. Clearly the Jill would of been a better Balancing choice when set aganst the Mid war US CV planes we have at present, and Ultimately the Best choice for Main Areana utility would of been the Grace.
Balance, the imbalance curently could be construed as more of an issue that the US does not have early war planes(or models) to set oppset those being represented by Japan, for some the mear fact that this is a reality could be considered a slap in the face. Howeaver I can not see how on earth this could be intentional.
It's kinda like that Tiger tank we got, she was not the best German tank, certainly the Panther was far more deadly and produced in far greater number's but less well known, it is the Hollywood efect.