The third is just a notation thing - piano/harp/celeste glissandos and arpeggios? It's actually easier for players to read and play correctly if they are written out. Also, the celeste doesn't need the 8 on their clefs, it'll just confuse the player. Ditto for the the piccolo and contra/double bass. Except worse because they can actually play an octave higher that written without much trouble.
Heck, I'd take it down more than that. Four horn choir - they can actually pull off a piano dynamic, so you can keep the whole notes, just mark it sf pp, sotto voce. Pull in the rest of the brass at fff, it'll be more dramatic.
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