I don't dissagree with you, in saying that the Yak-3 isn't "needed." As you've said, the 9U plays the role of late war Yak very well, and coupled with the La-7, the late war VVS fighter stable has some real teeth.
I even agree (how could I not?) that ToD and events should take the drivers seat from MA utility.
I was simply pointing out that it would likely find use in the MA, and is significantly different from the 9U. As opposed to the guy who thought they should have made a late model P-38J for example.
-Sik