When the D4Y prototype came out in 1938 it had shortened wings removing the need for folding wings on the carrier, the original power plant was to be a license built Daimler Benz 601A, the Aichi Atsuta was not available at the time, so a DB600 was installed. The DB600 produced 20% less horse power than was called for, even in trails it excelled in operations but a weakness in the wing root system made the first series of these a carrier based Recon plane, under the designation D4Y1-C. In march of 1938 the Model 11 came out and was put to fleet with reinforced wings and improved dive breaks. During 1944 the plane was easy prey for the allied aircraft, during the "Maraina Turkey shoot" due to the lack of armor for the pilot and the fact that the D4Y1 did not have self sealing fuel tanks. The later D4Y2 that followed had the same short comings, lack of armor, nonsealing fuel tanks, had an Aichi AE1P 32 in-line engine. The D4Y2a had improved weaponry, the 7.92 rear mounted machine gun, was replaced with a 13mm. The variant D4Y2a-C and D4Y2A KAI were modded for recon and Carrier Catapult launching. There was no effort put out to make the plane any less of vulnerable to allied fighters. In the Philippines they were shot out of the sky in mass. The D4Y3 had a more mechanic friendly, and reliable 1560hp Mitsubishi MK8P Kinsei radial engine. Again there was no effrot to install more armor, or self sealing fuel tanks. The several D4Y2s were outfit for Night fighting Armed with an an obliquely mounted 20mm cannon it saw marginal success as a night fighter against the B-29s. The final production version was a D4Y4 that carried a semi- recessed 1764lb bomb in the fuselage, and was single seat, its sole purpose was for Kamikaze attacks in the final days of the war. Due to the weaknesses that were never addressed in any production run, the 2038 planes that were built were never really able to press the fight to the allied targets. If the IJN Technical arsenal at Yokosuka had addressed the problem of the non self sealing fuel tanks and the lack of armor, from the beginning the D4Y Suisei(Judy) would have had a major impact on the war, other than just being Machine gun practice for the allied fighters. Yes it does meet the criteria for being put into game, but why when it was such a marginal contributor, and deathtrap to its pilots.
