If the Spit 16 isn't perked, then the Otsu never will. Definitely 5 ENY though, maybe 8.
that is your argument really? That the spit 16 is not perked? Imagine a 4 cannon spit - not a typhy or tempest as they have drawbacks - but a full blown 4 cannon spitfire that is actually better then the spit 16 (the Otsu is a tad better in performance). . .
The Dora, 51 and LA are also 'elite fighter planes', its just that fighter planes are designed to be fast, and the fastest planes (in the real world) have 'initiative'. Initiative is something you really want in controlling a fight, and the KI just does not have it. It does if the opponent makes the mistake of going co-E/low alt with you - but that is the same for a brewster or a zero. Initiative is king - that is why you climb to get it (banking E), extend to preserve it, and generally stay fast. The KI is a great plane, but sometimes you need a plane that has initiative or you will get swarmed and die - it may take 4 guys to get you, but you will die.
The sad thing is that many pilots mistake initiative for get out of jail free card. Does not matter in the end, there will always be the fastest plane. . .