Honestly? I think it's remotely possible.
Jarrett Guarantano, Derrick Brown, Nigel Warrior, Landon Dickerson, Janarius Robinson, Kyle Davis, Mecole Hardman. All are guys who are looking hard at the Vols (or have committed already), are all guys who could feasibly end up five stars (or are already). Rashan Gary and Kareem Walker are a couple who are already five stars - I think it's a long shot that either signs with UT, but anything can happen. BJ Emmons has a very long shot that he could turn into a five star, but he'd have to solve his academic problems AND have a phenomenal senior year to make it happen.
The possibility that four or five of that list break into 5* and end up in Knoxville is remote, but hey. It's July, we're all bored. It's a fun dream.