[Avodah] Changes re: VLamalshinim and Tehillim

[Harvey Benton]

A. VLAMALSHINIM:  
Berachos 28b discusses Rabban Gamliel adding VLamalshinim to the Shmoneh Esreh. Rabbi Mordecai Kornfeld, Rosh Kolel of Kollel Iyun Hadaf of Yerushalayim brings down (link below) many additional mekoros including the Yerushalmi version of events (Berachos 4:3 and Ta'anis 2:2). 
 
Discussed in the article is that according to some sources, Es Tzemach was added even after VLamalshinim. Wether or not this is the case, everyone agrees that VLamalshinim was added after the initial Shmoneh Esreh.  
 
My question is: since the initial Shemone Esreh was est. by the AKHagedolah, how can a later generation (R. Gamliel) make changes to it?  Wouldn’t the concept of greater in number and greater in chochma (GINGIC) come into play?  I was told that the GINGIC would only apply to abrogations or deletions, but not to changes or additions to any enactments.  Is this really the case?  Are there any other changes or additions in Rabbinic history (to earlier enactments) that would bear this out?
 
B. TEHILLIM:  
The Article goes on to discuss sources that indicate Tehillim Chapters 9 and 10 were initially combined (Tosfos to Megilla 17b on tradition of Rashi, as brought down by R. David Cohen), as were Chapters 1 and 2 (Berachos 9b).  R. David Cohen (as per R. Kornfeld) explains regarding chs. 9 and 10 of Tehillim that: originally they were one chapter and later the Chachamim split them into two chapters.
 
Again (similar to above), my question is, how could the Chachamim make changes to the layout of parts of Tanach, many years after it was already established exactly what they would contain?    
 
(Under separate cover I will ask R. Kornfeld as to a timeline of these Tehillim changes, how someone as late as Rashi could still have a pre change version, and how would that version disappear between Rashis day and ours.  Anyone interested in any feedback I obtain, pls. email me.) HB
 
Article: Berachos 029: Different versions of the Shemonah Esreh
http://www.mail-archive.com/daf-discuss@shemayisrael.co.il/msg00682.html
 
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