I wanna know. Anybody?

Ambrose wasn't on RAW because of what happened between him and Luke Harper at SmackDown. They even said that during a highlight on the show, I believe.

The same may have been done for Daniel Bryan because Sheamus rekt him.

Ziggler, I don't know why.

Although, they also may want more concrete star-power on SmackDown, so it's possible we won't see everyone on both shows all the time. I remember reading they wanted DB to star on SmackDown more in hopes it'll boost SmackDown's ratings.

Ziggler and Bryan got destroyed by Sheamus last week, therefor they're are selling Sheamus' attack by not showing up.

Place money on a Ziggler vs Sheamus match at AXEtreme Rules.

Ambrose had his handed to him by Luke Harper on Smackdown therefor he was selling that by not showing up.

It makes sense to be honest.

Right. Forgot to watch Smackdown, that's why. I can see Daniel Bryan putting his title on the line against the former champion Bad News Barrett, where Bryan retains. Sheamus in a feud with Ziggler with Sheamus going over. And also Dean Ambrose vs. Luke Harper at Extreme Rules so that Ambrose can finally get a PPV win.