Well, let's step back a minute.
Some guys you recruit with the expectation they will develop over time, and others you expect to be "instant impact" guys.
No program recruits a class full of "instant impact" guys every year unless they are able to replace them the very next year. That's a narrow group of schools - UK, Duke, and KU. Even those schools get their share of "program" guys who play well as upperclassmen - Quinn Cook being a prime example, and he was an important part of Duke's national championship team in 2015.
Our "instant impact" guy in the 2014 class at the four position was Chatman. Both you and I (and obviously many others) thought he could contribute right away. Wilson was clearly a longer term project.
Let's also be realistic - we didn't, for example, quit recruiting Kevan Looney because we preferred DJ Wilson.
So really, when you frame the question the right way, it becomes this: was DJ Wilson worth offering a scholarship?
Right now, he averages 10.2/6.3/1.4/.556/.435. And he's got two years of eligibility left. And that's where I disagree with your argument when you say, "he did not contribute until his third year regardless of the reason why." The "reason why" here is very important, because it means he's got another whole year of eligibility left.
If you knew, for example, that Austin Davis could post the averages above (without, of course, the three point shooting) in two years, I think you would have to view his offer much differently - especially, like in the case of Wilson, if it appears he still has upside.
Your criticisms of DJ were pretty accurate, to some degree. To me, the ability to play above the rim and block shots is a component of athleticism, and he's shown a lot of that. So I'd disagree with your view that he's not athletic. But I do agree, his lateral quickness is not great, and that matters.
But those criticisms, put in context, are reasons why he may turn out to be a good-but-not great player, not reasons why you don't offer the guy at all.
I'd also say that while DJ may never be able to fix the lateral agility issue, I feel like every game (other than Wisconsin), he shows us something new offensively. He's getting more confident (and competent) off the dribble, and he's showing some moves and skill around the basket. Two years from now, it would not shock me to see him as a real inside/outside threat.
And I'd say the same about Wagner, too - clearly offering him was the right choice, IMO.