With such a massive number of officers on their side why didn't larger portions of the army join the rebels? Frankly I'm confused about the whole thing, I cant seem to find any detailed accounts, and an overall chronology might be helpful.
Whilst I can't answer your question, I asked a similar question (about why it took 90 years for the bolsheviks to overthrow government when many revolutionaries had tried before them around 7 months ago that included the 1825 Decemberist Revolt which you may find interesting.
/u/International_KB answered my question, if there's anything they've said about the 1825 revolt that you find interesting ping them here as my thread's been archived.
Hopefully this helped :)