Photos aren't really enough to determine how similar the 2D patterns are in this case, you have to actually look at the patterns side-by-side, and in this case I don't really think Ojimak is being incredibly unreasonable, especially considering that I specifically used the F-15 as a sort of base when I designed the MiG-31, to help with the shapes for the model. Ojimak employed a method of construction for the center fuselage plus the intakes/engines in his F-15 that was ideal for the MiG-31 as well. The result was my tracing the parts in photoshop, stretching them, and then inserting the new textures details for the MiG. Just to show what I mean, here's an image comparing the similar parts from both models. The colored parts are from the F-15, the white parts are from the MiG-31, and as you can see, there is more than a slight resemblance.