It's unusual imo. When Bruce came back to Maiden they announced it in February and announced a summer tour right away. When GNR got back together, there were already tour dates announced and the reunion announcement followed soon after. I strongly suspect there was an extraneous factor that prompted the band to announce quickly. In normal circumstances, I feel like we would probably be getting the reunion announcement around now with tour dates following closely (the fact that there's a PR plan at all without an album makes me think summer tour dates are iminent).
I think it's just bad timing and DT's activities cycles clashing with what MP was already doing.
The guys were rebuilding their friendships over the years, and even JLB and MP patched things up. Whatever the details are, the guys eventually decided they wanted to get MP back. Their touring cycle for View was over after the summer shows, and they already decided (probably way before the decision to get Portnoy back, these things are well planned in advance) to go back in the studio in the autumn.
So, we've got two things clashing:
- Mike Mangini has already been told, as a band decision, that in September or so they'll start to record a new album
- The band decides that they want to get MP back
What else is left to do? stall for time? come up with excuses? start to record an album to fire the drummer mid-sessions? once their decision to get Portnoy back was final, the change had to happen before the next album cycle would start. And, alas, DT 16 album cycle would start in September. The only way around it was to go for it when MP wasn't even in the States for a proper photo shooting.
If things were different, if DT had an autumn 2023 tour lined up and booked already, I'm 101% sure they would wait it out until Portnoy was free of his commitments and make the change as soon as that hypothetical tour was over. They played some shows with Derek in late 1998 knowing already he was to go, they could have played some shows as well knowing Mangini was to be let go. But if you do not want to do DT16 with Mangini and DT16's cycle starts in September when Portnoy is abroad with other commitments......... what other choices do you have?
I mean, to summarize:
When is Mike Portnoy free from his already planned committments? early 2024
When are DT due to start DT16 cycle with Mike Mangini already being informed of the timeline? Autumn 2023
I can't see any other way around it than doing what they did, announce the reunion without an in-presence meeting and a real photoshoot available.