Your point is valid. There weren't a lot of teams beating the door down to get to him, but that is an oversimplification.
No playoff team, who thought they were "close" was going to give up a 2nd round pick.
No team that already had a young QB they believe in would be interested either.
Take those off the list of 32, and how many are really left?
I wanted to make this point, and it's pretty damn relevant, but it's a lot of work.
It's a similar question to ask regarding the 2020 draft:
How many teams that will possibly be worse than the Dolphins will be in the market for a first round QB?
I'm going to go ahead and rule out New England, the Rams, the Chargers, Kansas City, New Orleans, Pittsburgh, Green Bay, Chicago, Indy, Dallas, Philly, Seattle, Atlanta, Carolina, Houston, Baltimore and Minnesota, because I don't think there's any way those teams finish with a worse record than Miami.
That's literally over half of the league.
Of the rest, both New York teams, Buffalo, Washington, Arizona and Cleveland have spent a first-round pick on a QB in the past two years. Arizona obviously did it twice. I don't think any of them do it again in 2020 (unless Josh Allen completely implodes).
That leaves Tennessee, Jacksonville, Tampa Bay, San Francisco, Denver, Detroit, Cincinnati, and Oakland. Bruce Arians apparently is enamored with Winston (although of course that could change). Jacksonville just signed Nick Foles. Denver drafted Drew Lock (and I think they're going to win more than Miami anyway). San Francisco has Jimmy G on a huge contract.
That leaves Tennessee, Detroit, Cincinnati and Oakland.
I believe Detroit has the potential to be really bad, but they do play a last place schedule...and holy God that Stafford contract. Do they finish worse than the Dolphins, and decide to use a high first round pick on a QB knowing that he'll sit a year behind Stafford? Maybe.
I do not believe Oakland will be worse than Miami. I just don't. They spent a ton on their O-line, added Antonio Brown, and drafted (arguably) the best RB in the draft...and also beefed up their safeties. Could Richie Incognito go bonkers and blow up the stadium? Maybe.
Cincinnati and Tennessee genuinely concern me as two teams who might very well be worse than Miami AND be primed to draft a QB ahead of them. Cincinnati drafted Ryan Finley in the 4th, but I don't think that means a thing...and here's the real fun bit: I believe Derrick Henry is going to be run into the ground in 2019, and he's going to earn a few wins practically by himself...but the other guy who might keep Tennessee from being worse than Miami in 2019? Go ahead. Say his name.
Point being...I think the likelihood of multiple teams that will definitely be poised to select a QB AND finish with a worse record than Miami is fairly slim. If you're in the "Tua or bust because every other QB in the 2020 draft, and also the history of the world, is trash" boat, then maybe be a little worried.