I don't remember exactly, but I thought Invitation used to be above Diamond before ? now in this new list Invitation is somewhat "downgraded" and is now considered same level of upgrade priority as Diamond ? so e.g. now maybe a Diamond on a full J fare would get upgraded before an Invitation on a D fare ? (assuming within each upgrade "tier", fare class is considered to determine upgrade priority; I don't really know what exactly are used as tie-breakers within each "tier")