Part of the difference here is Sonny is alive and in his seat as a member of the Five Families. He and Jason are beefing and he's no longer his enforcer. I would think that the other MO5 are that concerned because Jason is Sonny's problem to deal with it. Plus, Jason has been touted as the bestest enforcer ever. He has spidey senses and can shoot the top button off a man's shirt from 100 feet away.
Only thing missing from his black t-shirts is an "S."
Carly calling the shots:
Can't find Ms. Wu's threat but found this in a recap:
At the Corinthos estate, Carly and Jason discuss Ava’s remarks about marriage in part being a contract but also theater. Jason feels they have to show the other families that they are both strong and united, and Ava’s solution would show them that. Jason says this step isn’t a magic bullet and won’t guarantee peace, but it will send the message that she supports him as the head of the organization. He admits it’s the best option for the business. Carly wonders what this would mean for their lives as people. Jason points out there is no going back from this, so they have to weigh what they gain against what they lose. Carly knows everyone will think she planned this given their history, but he says they’ll know why they did this and that is all that is important.