[lojban] {kau} vs. {ba'e}

[la gleki <gleki.is.my.name@gmail.com>]

It was previously mentioned that 

{.i ko'a broda xu = .i xu ko'a ba'e broda}

The example

http://dag.github.com/cll/11/8/

8.4)   mi djuno le du'u

             la djan. kau pu

                 klama le zarci

       I know the predication-of/fact-that

             John [indirect question] [past]

                 going to the store.

       I know who went to the store, namely John.

       I know that it was John who went to the store.

is rather interesting.

It shows the shift of focus to {la djan.}

Then why not use {kau} instead of {ba'e} all the time?

{mi kau djuno le du'u la djan. kau pu klama lo zarci} ?

If you need arrange foci by their strength you can always say

{mi kausai djuno le du'u la djan. kau pu klama lo zarci}.

So my question is:

in what cases {ba'e} is irreplaceable?

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