The race to #1 overall has been on for months. The Dolphins did almost nothing this off season. They paid down debt. That's pretty much it.
They drafted Christian Wilkins and accidentally got lucky on a UDFA Preston Williams. Both will be rookies. Even if they're successful rookies, they're not going to big high impact. Rookies are rookies.
Meanwhile they jettisoned Ja'Wuan James, Cameron Wake, Frank Gore, and Robert Quinn, and then downgraded from Ryan Tannehill to Ryan Fitzpatrick/Josh Rosen (yes, that's a downgrade). Those were all impact players, flaws or not.
They might get lucky on some other scratch-off tickets.
One of my personal favorites that way is Chris Reed, but I have no illusions that they picked up the next Evan Mathis. I just think that WHEN Daniel Kilgore goes down injured this year (which I personally think will happen), Reed could step in and keep that particular position stable, maybe even play better than Kilgore. If you're a TANK guy, that's not a great thing because losing a starter like Kilgore and then having a circus of guys like Tony Adams and Kyle Fuller try and take up the job is one of the ways you end up with that 1-15 record.
Jaryd Jones-Smith could also end up an accidental find worth sticking on the roster longer term, albeit simply as a swing backup.
They may have also pulled a happy accident with Nick DeLuca, but I would have a ton more I would want to see before I really breathe life into that one.