I guess some folks have never played HS or college sports or coached.
Progress is not a linear ascending line, there are many peaks and troughs along the way. And the projected trendlines are not always 45 degrees.
This. You saved me the trouble of posting it.
I'll add that younger players, even really good ones, often have technique problems that need to be coached up. That can cause a player's performance to visibly suffer in the short term. Because they have to first unlearn the old way, then learn the new way, then practice the new way until it's instinctive.
But it pays off in higher peak performance than could be achieved without it and just about all good coaches will make that trade-off, albeit as much in the off-season as possible.
It's entirely possible that's happening with Cliff right now. And if he's still growing some, that's going to cause some minor, momentary, coordination loss. Not sure how old he is, but a lot of tall kids keep growing their first couple years in college.
As others have said, he looks to me like he's not only going to be fine, but he'll be really good when everything comes together. He has all the raw talent and just needs refinement and experience.