So...if I understand the rules correctly, only the order of the albums is reversed, but everything else, including band member changes, remains the same. Therefore, we get
The Astonishing with CD on vox, KM on keys and MP on drums.
DT12 with the same lineup, except for JLB on vox.
ADTOE with the same lineup and with KM leaving at the end of the recording. Would MP then call out Beneath the Surface as being entirely KM's creation and something that wouldn't have been included if they had known he was leaving the band?
BC&SL and SC with DS on keys. In this alternative universe, the ultra-disappointing SC has replaced the disappointing FII as DS's swan song with the band. Many years later, someone starts a thread on the DT Forums that claims that SC was DT's "last truly great album."
That makes 8VA the debut of new keyboard player, JR. The band is hailed for the fresh life that JR breathed into the band. Everyone loses their minds trying to figure out why the band's sixth album is so heavily focused on the numbers 8 and 5.
We then have the JP, JM, MP, JLB and JR lineup for ToT through ACoS, after which MP quits the band, still harboring lingering bad feelings resulting from the record company forcing a band with DT's track record to work with an outside writer on FII after the massive critical and commercial success of SFaM.
DT unveils its new drummer, MM, by releasing Awake and then release I&W and WDaDU, which is panned for being a massive regression following the first two strong MM-era albums.