Folks seem to think Riola is "special" beyond being a five star. The Dawgs have a 4 star commit that same class (Puglisi?). And they have as noted two sophomores, one 4 and one 5, and a junior, Carson Beck, a 4, who is the likely starter. So, they are stacked, for now, and yes, some of those guys will portal.
Vandagriff is from just outside Athens, he might think being QB2 at UGA is fine with him.
If we presume Riola is the best thing since Matt Stafford, he could come in and red shirt year and be ready to start in year two presuming he can beat out Puglisi and Vandagriff, or maybe V leaves. Some Dawgs think Riola will bring in other 5 stars, who knows.