I say that Rick did not tell them for two reasons: 1. Jenner was acting all kinds of crazy. While a scientist, he had given up hope and was ready to die. Rick may not have fully trusted that Jenner was lucid. 2. Why destroy the group's hope if you don't know for sure? That explains him wanting to hang Randall. You hang him and wait. If he reanimates without being bitten then you know for sure. He is suspended from the rafters away from poeple. You can then shoot him from a safe distance. I am glad that he lost his shit with the group. I wanted to reach through the TV and stangle Lori. She practically begged him to kill Shane not too long ago. I love that Daryl and Hershel were ready to hang on. Daryl is a loyal ole dog, and Hershel has accepted that he might be out of his depth. I can understand T-Dawg wanted to head out. That was traumatic, even condsidering all they have been through. I must say that Andrea's reprieve was all kinds of creepy. The lack of arms just sent shudders through my being.