This is basically the standard that much of the Buddhist Studies community sets for thier speculations so you are in good company! 
The problem here is the almost total absence, except where they are clearly interpolated, of many of the essential examples of these short formulas, from all of the silakhandhavagga, most of the rest of DN, and much of MN. For the most “prestigious” scholarly work on this see Vetter, for my own, see the thread:
https://discourse.suttacentral.net/t/are-khandhas-early-or-late-ebt/
For the SN - MN - DN theory to work the long discourses would have had to lose almost all awareness of the aggregates before VN and AB “rediscovered” them.
This applies to several other of the “formulas”.
Anyway, There are definitely plenty of people here who agree with you on this, but I am afraid that what seems plausible or implausible to you really does not concern me.