I don't really have a feeling one way or the other about what McBeth wanted, but it really makes no sense for DD to have had the resources to match or beat the Discraft deal and McBeth deciding not to talk to them. McBeth was looking to make a deal. He is friends with the owner of DD. He used to be sponsored by DD before they started their own disc line. He probably would have a higher comfort level with DD than with Discraft because of that. There is nothing that makes me think that McBeth would say "Dynamic might have the money to give me a better deal, but I'm not going to find out."
What makes a lot more sense to me is that DD reached out to McBeth and in the course of that both sides realized that DD did not have the resources to get close to the deal McBeth was getting from Discraft. So a McBeth/DD deal was never explored because they both knew there was no reason to. That makes sense to me. The fact that Rusco confirmed that they couldn't match the offer makes that seem like the story to me.
Or maybe his mind was already made up, through the agent.
https://discgolf.ultiworld.com/2018/11/19/paul-mcbeth-teasing-discraft-move-weeks/