The 23rd pick is not the only way to access our future firsts. They could take a second or just cash like has been done several times to free up picks for big moves, and take next year's pick guaranteed.
Chicago could say no to the deal but in so doing they would probably cause us to trade Dame and start a youth rebuild which would make it iffy if they would ever see that pick. Also due to the pick not being guaranteed, it has very little trade value for Chicago in it's current state but if they had a guaranteed pick the 23rd this year or our pick next year unprotected that would be worth a lot more in a trade. It's a win win and that's why it has cost virtually nothing to do in the past. I've already looked up the seven or so times that protections on traded picks have been modified. Just search it and you will see that no one has ever had to pay more than a second rounder and/or cash to make the pick they owe a team more valuable.