I don't think it's a case of "poor" Mojica. He discovered some important properties around the palindromic nature of DNA in bacteria, as did others in Japan. While it was important, it is not the same level of contribution as Doudna and Charpentier. I don't think that there is much debate around this.
I disagree, he did not discovered a property, he discovered and described the CRISPR mechanism. He deserves a big part of the credit, without CRISPR there is no CRISPR-cas9. With this award, they are neglecting basic research and just rewarding the applications. Btw I highly recommend to read the Mojica story it is fascinating how he found it and understood how it worked.