R' David Bannett wrote:
> 1. In T. Bavli, Shabbat 115,  Rashi explains that
> while one reads nevi'im on Shabbat one does not
> read ketuvim on Shabbat.
> 2. Magdil yeshu'ot is in Tehilim. Tehilim is in
> ketuvim. One does not read ketuvim on Shabbat.

Are you suggesting that we should skip Ashrei (and most of the rest 
of Psukei D'zimra) on Shabbat?

Or perhaps what you mean is that Rashi skipped Ashrei on Shabbat?

Akiva Miller