I don't know why everyone is freaking out, we were told this would happen.
The kid was told he could go #1 for almost a year leading up until the draft, he had a price tag and the Sox have a budget. He fell far enough that his price tag was impossible to meet, the Sox new that, his agent knows that and everyone said the negotiations would go right up until the deadline. This is not unnatural.
I have no ideal what the conversation is but it's probably something like this. Groome and his agent are asking for 4.5 million, the Sox have offered 3.5, they are both posturing and will eventually settle somewhere around 4 million. I was earlier optimistic that the real number could be as low as 3.75-3.8 but admittedly I'm optimistic that number could easily be 4 million to 4.2 million. But both sides likely have the capacity to budge. You don't go to a negotiation table with your best offer.
Often guys are drafted with an agreement of what it will take to sign them, when a guy like Groome falls things change because the Sox probably weren't in contact with his agent due to the fact that no one knew he would drop that far. That doesn't mean they didn't have preliminary talks on draft day with ballpark figures and an understanding that they thought a deal could get done. I have a hard to time believing they would draft him if they didn't think they had a good shot at signing him.
Relax, to reiterate my points, this is a negotiation and it was said in the very beginning by everyone in the know that it would go right down to the wire. I'm 95% sure he signs by the end of this week.