I am not comparing here but implementing ring signatures will take considerable change to the codebase and it hasnt been implemented on a protocol other than cryptonote yet, so its questionable
Ring sigs are not a particularly new concept. I suggested them myself a few hundred pages back without knowing what they were or that they already existed. Evan has proved himself competent and has completely delivered so far on all he's set out to achieve. Evan wants ring sigs, ring sigs will be implemented.