If you flash. it will overwrite system data so everything you de-bloated will be gone most likely.  If the rom is de-bloated, you will still be de-bloated.  If you load a full rom like the DL09 full, all the bloat will be back.  The DL09 leak is rooted and de-bloated.  The full DL09 is not rooted and not de-bloated.
make sense?