GG is a guy you can give the ball to in isolation and he's going to get a shot off. That's his skill, really. He'll shoot over wing-sized defenders, and he'll get by bigs who are slower than he is. What happens next could be a mystery. He might brick a jumper. He might commit an offensive foul or turn the ball over. His efficiency is a real question mark. However, it is really difficult to find guys who can always create a look for themselves and therefore be a number-one option.
That's the Jayson Tatum / Paul George / Jimmy Butler scoring wing that wins playoff games. Some nights those guys might shoot 4/15. Other nights they make the difference between winning and losing. With GG, you're buying a lottery ticket on an 18 year-old who has the tools to be that type of player.
If you look at this draft, other than Wembanyama, the Thompsons and hopefully Cam Whitmore, there just aren't many guys with that type of upside. Another one might be Bilal Coulibaly if you think he could develop into the French Penny Hardaway.