Storming Ox had lost hope when he witnessed the death of his master by Shen's new weapon, and surrendered to the peacock's will.

Is Master Rhino death?

When not engaged in battle or leading the Kung Fu Council, Master Thundering Rhino can be humorous and a great resource of wisdom. ... His victory was accomplished with such ease that Shen stated that he was a "showoff." Unfortunately, Thundering Rhino was no match for Shen's powerful cannon, and was killed on impact.

Does Master Oogway come back?

In "Ghost of Oogway", it appeared that Oogway returned to the Jade Palace as a ghost to mentor Po. However, this was later revealed to be a shape-shifting trick of Junjie, who had attempted to take over the Jade Palace once again by trying to trick Po and the Furious Five into shirking their training.