We all know Jerry wanted Manziel, but what evidence do you have that he "scolded" Stephen? Like you said, he agreed to go with Martin because none of the others in the room wanted to go with Manziel, so it wasn't just Stephen that was responsible for the choice. And it is ultimately Jerry decision, so he could have overridden all of them. .
As for Dak, yes, we know Jerry wanted Lynch & tried to make a deal, but are you sure others in the organization didn't also want Lynch? Regardless, he didn't give up whatever it took to make the deal.
As much as I hate to give Jerry props for anything, both of these things seemed like a good sign. He was willing to listen to others in the organization about Manziel, which is not something Jerry had been credited with doing in the past, and he showed restraint in his negotiation for Lynch.