Because you are only allowed to do it once and withdraw your name and retain your eligibility. That is why it makes so much sense for juniors to do so. A number of ACC players HAVE also done this, some younger than Doral and Craw - like Josh Okogie, Omar Yurt, Deng Adel, etc.. A lot of the names we are still waiting to hear from are YOUNGER than juniors and played in the NCAA tourney so have had less time to process the process. Google guys. It's out there.
If I were both kids, I would come back. I expect Craw to depart and Doral to come back. I could even see a Craw try and graduate this summer and play somewhere else for a year, if possible. Here's why: the year was no fun for Craw. The year was pretty rewarding for Doral. The pressure was on Craw to lead and he failed, and I am sure that sucked for him. Doral over performed and was an integral part of a team for the first time in 4 years. That is almost unheard of for a college athlete.
Both should come back because next year they will walk onto the court each and every game with comparable or better talent than 95% of our opponents. That was not true this year. Would be a huge life blunder to bail now. And that is what it would be - bailing.
Next year for reasons having nothing to do with the coaching staff will most likely result in a fun year. That is worth staying for IMO.