All three "Super Saturday" commits are underrated, IMO.
Tucker is underrated because he has played more LB than Safety in H.S. and projects as a college Safety. Few guys have the quickness to react and get to a spot like him. These are highlight videos, so we have no idea how consistent a tackler he is, but he does look good in the highlights.
Alfieri is underrated because his ranking doesn't translate to the speed, explosiveness, and athleticism demonstrated in his highlight package. There are not many guys who can do what he does at any size, let alone 6-2 230.
Okereke is underrated because he plays for a high school that hasn't had a major college prospect for years, and because he hasn't played football very long; he's a bit raw and unrefined. Yet he's clearly a very good athlete with a big frame and upside potential.
Alfieri should be a four star, IMO and is on Rivals, but not other services. My guess is he will earn a 4th star by the time all is said and done.
Tucker should be a three star now, but if he were to play Safety in high school this season and show more ability in pass coverage, that could warrant a 4th star for him.
Okereke likely won't be ranked any higher just because he's seen as an athlete by the services, plays too many positions, and is so raw.
From a pure potential standpoint, these guys are elite recruits, even if not rated as high as others.