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Considering all of the Primarchs are beings infused with a lot of Warp energy, one of them being a blank is impossible. All of the Primarchs were able to see through the Emperor's glamour after initial observation.

The Emperor doesn't seem to much care about the Astartes recipe, since he just let Corax take it to a poorly defended world, and Corax was able to improve on it in short order which was also okay. Although, honestly, that last part is very stupid in my opinion. I much prefer the original fluff where Corax' tinkering to make "super" Astartes came with a terrible price, rather than the idea that a non-scholarly Primarch and a couple of human geneticists could improve on the Emperor's design in a couple of months and the Alpha Legion did their perfect infiltration and botched it with daemon blood. Alpha Legion are the stupidest thing in 40K now. The Blood Ravens' primarch is Alpharius, because all of the members are secretly Alpha Legionnaires.