It's worth pointing out that even a top 3 pick in a better-than-average draft is no guarantee.
Here's a recent list of draftees who were on par with the top 3-5 guys this year, or better, in terms of hype. I think this is a conservative list, in that we are still in the honeymoon phase with the 2017 class...a few of those guys will probably decline over the course of the year, as their games are scrutinized more closely.
KAT
Okafor
Russell
Wiggins
Parker
Embiid
A. Davis
Irving
Wall
Griffin
Rose
Beasley
Oden
Durant
Bogut
Marvin Williams
Deron Williams
CP3
I guess the question is, would you give up a random shot at one of these guys for Cousins?
By my reckoning there are three guys better than Cousins: CP3, Durant, and Davis.
A few guys are about equal: Rose, Wall, Irving, KAT. (For Rose, I'm talking about his pre-injury career as well as what happened since).
For all the excitement, the jury is still out on Embiid.
And the rest are either a little less valuable or a LOT less valuable. A Beasley-type outcome or an Oden-type outcome is a real possibility, you can't ignore it.
Either way, I think you have no higher than a 50/50 shot at matching or beating the Cousins outcome. And I think this probably overstates the odds, because there's no guarantee that someone like Josh Jackson will end up as a "tier 1" prospect. (Remember, Ingram was a "tier 1" who was downgraded by the end of the year).
Now, the thing is, the guys who do beat Cousins may be significantly more valuable, because of the importance of superstars. But it's worth noting that those guys have a total of zero rings between them.