I think Grant is on the won't improve list as well. His deficits are in the area of physical athletic talent which are the hardest to fix. But too each his own.
I recall watching the draft and commentators saying the GWill pick was really good.
Same guys who liked Fultz? they were wrong too. Dragon Bender, same thing. Drafting is a crap shoot.
His 26" standing vertical was a good warning sign. Leaping isn't everything is basketball but it helps in a multitude of ways.
From CBS Sports:
22. Boston Celtics: PF Grant Williams, Tennessee
What is he exceptional at? He's exceptional at playing basketball. He's not as tall or athletic, no, but he played in the most athletic league in the country and got where he wanted to get. Look back at a recent drafts -- at a different position: The same things people say about Grant Williams, they said about Fred VanVleet, Jalen Brunson. NBA GMs are learning: Just take guys who are awesome at basketball. Grade: B
From The Ringer:
22. Boston Celtics: Grant Williams, F, Tennessee
The Celtics are taking advantage of having so many first-round picks to attack the draft in multiple ways. Langford was a classic buy-low pick—a player who might have been drafted lower than he should have because of extenuating circumstances (in this case, a broken thumb). Williams is the opposite. The junior big man was one of the most dominant players in the NCAA last season, but concerns about his athleticism and lack of an NBA position caused him to slide to the end of the first round. The key for Williams, who played out of the post in college, is to become more of a 3-point shooter. He could certainly make the transition. He’s an excellent midrange shooter with a high basketball IQ and a soft touch around the basket. If he extends his shot, he has a chance to dramatically outplay his draft position in Boston.
If this was true then why did his draft position fall to us, there is always a flip side.
From NBA DRAFT NET
Weaknesses: Williams is an undersized forward at 6’7 which is small for a player who lacks in athleticism and makes most of his impact in the post … Not an explosive athlete, plays below the rim … Foul prone, fouled out of 4 games including two matchups against top talent in the country in Gonzaga and Kansas … Williams struggles to stay in front of quicker guards due to his lack of athleticism and height … While capable of hitting from beyond the arc, Williams digressed from his freshman year to junior year. Very capable from mid-range and the free throw line, but needs to continually improve from three if he plans to find a role as a small-ball four in the NBA … Hesitant to utilize jumper, typically makes impact in the post or opts to pass on open shot to get the ball into the block … Williams may struggle to create off the dribble considering we saw most of his offensive skill set in the post or catch-and-shoot opportunities on the perimeter.
So there was bad out there too easy for all to see.
He does not have a position. Too small to guard bigs, not athletic to guard wings. Can't get off a shot in close proximity to a defender. He can shoot threes at what 39% trouble is he has to be very wide open to get off the shot and his team mates you can tell don't trust him on offense. There are reasons for that.
Grants is not the problem but he is prime example. Let me make that clear. But general lack of talent is the problem not Grant. He does seem like a great guy and good human being so is Mr. Rogers and he didn't make it in pro basketball.
Just for laughs we are 7-4 when he does not play
https://www.statmuse.com/nba/ask/celtics-record-when-grant-williams-does-not-playGuy is not good enough to be playing rotational minutes, fine end of the bench it is not his fault but with us this is true of half our team. It's Danny fault for assembling this team of mismatched parts and drafting him in this case.
It is easier for an athlete to develop skills than a non athletic guy to develop athletic ability. This is true, look at Rob and Brown as examples and I realize some athletic guys never blossom. But how many non athletes become better athletes. Strength you can develop but vertical is very hard to improve and speed and quickness. Please note that they can be improved but just not as much as skill or strength.