Different baryons routinely annihilate. Like antineutron and proton. Wikipedia article on annihilation acknowledges this. But at https://en.wikipedia.org/wiki/Annihilation#Proton-antiproton_annihilation near end of first section, I find statement: The most common (lowest energy and longest lifetime) baryon that shares no flavour with nucleons is omega hyperon. Annihilation of antiomega hyperon would be energetically favourable. 1672 MeV of Ω plus 938 MeV of proton sums up to 2610 MeV, while 3 kaons would be just about 1490 MeV. So, does antiomega hyperon have a conspicuously lower annihilation cross-section and longer lifetime in matter compared to other antihyperons which do share quark flavours with nucleons?