Saul does know that.
Kalani and
Datu bring
Burt and Saul up to speed when they arrive at LAX to start working on the chopper. Saul knows
Pippin is dead and that
Lewis is in custody for the murder.
And as Osiris said above: Pippin's one purpose could have been to keep
the Tower distracted by having them focus inward, while
the Mallers are performing activities around their walls. After all, from the Mallers POV the Tower are a bunch of authoritative assholes and bullies: They stole their tanker (which they were planning on using to kill the zombies en masse), they spied on their home first, they ignored the offer to be let into the Tower, they fired the first shots of the War, and the Tower called the zombies to attack the Mallers (they don't know its a fact, but they do suspect it).
If I were the Mallers, I'd want these group of aggressive assholes (who also are the remnants of the authority structure that imprisoned them) to be distracted at all costs.
EDIT: Fixed my typo (Kalani vs. Pippin being dead), so I deleted your post questioning what I was talking about.
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