I'm not trying to say he isn't an elite player but I certainly wouldn't say he's the top overall prospect in the country. That honor probably belongs to RB Najee Harris who has occupied the top spot in my rankings from day one.
In fact, I believe there's a few offensive tackles better than Sarell. One could argue that Alex Leatherwood is the top tackle in this class because he's a tad more aggressive. Trey Smith is another who is rated higher than Sarell in my opinion. As is Calvin Ashley, Josh Meyers and Jack Anderson. I could talk recruiting and rankings all day long.