"is maneuverable enough to take advantage of mistakes by the pilots of these bird in close dogfighting."
Isnt thats what they all do it win? Can the P-39 do that, yes, or no?
Its not correct that it has no attributes that are better than some fighters on that list. It can out dive some, out roll some, and has a lower wing loading than some. Its manueverbility in certain speed regimes is better than some. The P-39Q has a decent blend of attributes that make it a competative fighter in LWA. Not uber, not the best, competative.
Wing loading list at 50 fuel, clean, best to worst:
Spit XVI: 30.15 ft lbs
P-39Q: 33.35 ft lbs
Ki-84: 33.85 ft lbs
N1K2: 34.23 ft lbs
F6F: 35.13 ft lbs
F4U-1D: 36.51 ft lbs
P-38J: 50.37 ft lbs
Thats just one attribute, hardly the worst. Im not going to argue flaps and corner speeds, im simply pointing out that its a false statement to say it has no advanatages over any of the others.