He's not NBA level. He's not. He can shoot well when open and can get hot sure. But he isn't great at going to the hole. He doesn't have a good enough handle. Turns it over quite a bit. And look how he did against Wagner. He can't guard him. Not even a little bit. Wagner is a NBA talent but not superstar talent. How would JW do against some of the really good and great 2 and 3s in the NBA if he can't hold his own against Wagner? I can understand why Cook left to an extent but if JW leaves early that would probably be a mistake for him.
I think Garza and Wieskamp are both very long shots for the NBA. Both are great college players, but I don't see either of their games working out at the next level.
The problem is, the proverbial "clock" in the NBA ticks loud and fast in terms of how much time they give you to demonstrate your upside before they'd rather start over with a 19 yr old one and done kid. You can find exceptions to this (and I'd wager it's *slightly* more forgiving for big men than guards), but if you're coming into the league with 3+ yrs of college ball under your belt, there is a lot of pressure to be a turnkey performer. A 22-23 yr old "project" with a likely ceiling of being an off the bench role guy? NBA GMs have the luxury of just going out and grabbing the next 19 year old who might be making All Star games by age 22-23.
Obviously, I'm generalizing - you can find special circumstances that run counter to what I'm saying, but there's no doubt the prevailing winds blow as I've just described. This is why even fringe/long shot guys like Wieskamp feel that pressure to go ASAP.
One of my favorite Nuggets is Monte Morris (don't shoot me, pls), he's a great example. 4 year college player, stepped into the league and played from day 1 like a seasoned vet. It's stopped now because he's a known performer but in that first season it was an endless stream of "wow, he was a 4 year college guy but he's this good?!?" commentary. At his age, it was do-or-die for Monte. Monte, in addition to having a savant-level hoops IQ (ast/tov ratio is always off the charts), can shoot it, drive it situationally, and defend...and that gets him 15-20 min/night off the bench.
I think Wieskamp would need something like a summer league performance where he shows himself to be absolutely unconscious from 3 AND get lucky to be matched up with someone favorable on the defensive end to give teams at least a glimmer of "maybe" that he can at least be passable on the defensive end.
Garza's a trickier eval I think just because he's such a throwback. As an NBA GM, I think I'm more likely to take a flyer on Luka just because, relative to Joe, I'm really not sure what's going to happen when I put him out there in summer league but I'd kinda like to find out (for future reference, if nothing else). I see a lot of comps between Garza and Jokic. On a level, I can see why people go there - you're trying to make a case for a big guy who lacks the athleticism to be a rim protector. Conventional wisdom says, in the modern NBA, if they're going to play a traditional big guy, teams demand that big guy be a rim protector. Garza can't do that, but what about Jokic, right? Well, I've seen every game of Jokic's career. Like many NBA players, he's a freak of nature. He can bang in the post with super soft hands to keep the ball alive in those sloppy close-in situations. Hey, that's Garza! Both guys can also step out and shoot it. I have a very strong suspicion that, if Jokic had played college ball, he could have done damage at the 40%+ level from 3, but I can't prove that so let's just leave that alone. Things are looking good so far. Garza is a good enough (and willing enough) passer to extricate himself from low percentage looks. That's great and an unheralded part of our success as an offense this year. Yeah, well, Jokic thinks he's the second coming of Magic Friggin' Johnson. I'm 100% certain, if the Nuggets didn't count on Jokic to do ~25 pts/night, he could do something in the neighborhood of 12-15 apg. Oh, and Jokic is like a 80%+ FT guy, so you don't need to even think about situationally subbing. Oh, and due to his super high basketball IQ and ability to see what guys are going to do before they even know what they're going to do, he makes all kinds of plays (especially steals) on the defensive end that, given his general lack of athleticism, would surprise you.
To make a case for Luka, I would need to see, at summer league, a lot of NBA caliber talent looking like they don't know what to do against a guy with traditional big man skills (which is what we've seen over and over again in the college game). My fear would be, at the NBA level, the overall athleticism is such that Garza's finesse + brute strength combo are not enough...but I'd be willing to find out for sure. If he proves he can score in the post at this level, then I'm willing to take a slightly closer look to see what kind of 3P% shooter he is and what his ceiling is a defender with the right coaching.