Earlier tonight I was on a flight that had an equipment change after boarding and we had to move to a different gate. Shouldn't everyone on the upgrade list have gotten the -T designation on the 2nd upgrade list due to the MX irrops? I had the same position on the upgrade list before boarding at both gates but during boarding I noticed I moved up two spots on the list. Someone was actually called back from coach into first just before we left the gate. Does that mean at least three people who were in first were rebooked (first was full on the first plane) or is it more likely just the one person was upgraded and my position changed for some other reason?