It’s not at all a stretch.
A uncountable number of genes are at play and we just don’t know enough about the vast majority of them to know what it is doing what and why.
I had a discussion on here with @t_h_wyman about using CRISPR (basically advanced genetic selection) and in conclusion we just don’t have the resources or commitment to make such a database to the point we can pinpoint exact genes. Mojave could definitely have something underlying that we just don’t know about yet.