Dak has leverage over Jerry period. Dak is comfortable walking away from the Cowboys. Jerry will be embarrassed when it happens.
CD currently has no leverage. The reason Jerry has no urgency. CD is under contract and can be tagged next year. CD will play this year with or without a new contract.
Jerry is not ok with the consequences. Jerry wants to hang out at the rim. These consequences will not even get him in the gym.
Again, you are letting your emotions (especially "fandom" emotions) make assumptions that are not based on facts, but opinions.
The Cowboys can say they want Dak back in the media but they could internally have decided to move on from him in 2025. Sure, they could offer a lowball contract and if he accepts, great, but if not, so be it.
As I pointed out in my previous posts, we fans and the media simply do not have all of the information.
It's quite possible for example that the hold up with Dak is all about length of contract or something like demanding a "no trade clause" which has nothing do with money.
Both sides have leverage and whatever side someone is on they will think their side has the most.
In this case, I have no side so I really don't care who "wins" the negotiations or even if it falls through. Both sides have leverage, and likely a perception of more than they have.
As for Lamb, he has leverage because he can hold out for part of the season, pay the fines and if the Cowboys lose games, the media and fans would put pressure on Jerry every single day (especially after losses) to extend him.
Lamb's leverage in 2025 will be the amount a one-year franchise tag will cost as top receiver contracts are surpassing mid-tier quarterback contracts these days.