[Avodah] Each tribe had different Torah?

[Zev Sero]

Daniel Eidensohn wrote:

> Pesikta DeRav Cahane[1] <#_ftn1>**(Appendix 1): *R’ Huna sated that 
> Moshe wrote 13 Sefer Torahs. Twelve were for the 12 Tribes and one was 
> given to Levi’im so that if one of Tribes wanted to elminate anything 
> from the Torah – the Levi’im would be able to produce their Sefer Torah 
> and correct the false text.

What if Shevet Levi decided to change their Torah?  Presumably they
would be prevented by the same mechanism - the other 12 tribe would
produce their Sifrei Torah and force Levi to reverse the change. But
if so, why does R Huna phrase it like that?  Why not just say "if one
of the tribes wanted to change anything in the Torah, the other 12
would correct them"?  Why single out Levi as the tribe least likely
to want to change things?

-- 
Zev Sero               Something has gone seriously awry with this Court's
zev at sero.name          interpretation of the Constitution.
                       	                          - Clarence Thomas