Great question. Two points.
1. This might be a great Poll if you choose to make another thread
@BahamaFinFan78
2. Kudos for not listing Kyle Pitts as he is a TE and would derail your conversation.
Honestly, I'm usually pretty decent at ranking WR's, but this class is quite hard after the first few. Rondale Moore is small with an injury history, so you're not really ranking his top end potential because he will have difficulty beating press and staying healthy. Some of the other WR's might not even be considered second tier in other drafts, as they're rather average. Last year's second tier class really balled out, so the expectations are probably too high for this year's class, IMHO. Then you get guys like Kadarius Toney, who is extremely electric ... but harder to project to the NFL. Is he the guy we saw a couple years ago, who is good and has potential, or is he the older Toney we saw last year who really exploded? Can he maintain that productivity with the step up to the NFL? Is he big enough?
Last year it was easier for me. It was pretty clear that a Tee Higgins and Chase Claypool were going to be successful. But the success of a Claypool in the 2nd round has raised expectations for a Kyle Pitts to the point he's now likely to be the highest TE prospect ever drafted. Pitts is a great prospect, but not sure he really needs those type of expectations, because TE is a very tough transition from the collegiate ranks. Similarly, there's a lot of true WR's who are tough to project. Not sure I'm really confident enough in my current rankings to rank them, even this close to the draft. I'll just say that I'm a believer that there is a bigger gap from the top guy (Ja'Marr Chase) to the guys in the second tier than most people seem to think. But, I'm not sure that the gap from the second tier to the third tier is quite as big as most people think.
Each year the internet prepares QB's and WR's earlier and earlier, to the point where they come to college pretty sophisticated on offense, and the college coaches can really build upon that to prepare them for the NFL. Each year the game increases its offensive focus and pass-centric offenses. More and more elite athletes are leaning towards WR and less towards LB, DE, and DB. This means it's a lot easier to find those great WR's deeper and deeper in the draft, but those elite defensive players are getting harder and harder to acquire ... thus bidding up the value of those defenders and dropping the draft positions of all those WR's.