If he shot 3's in high school, it couldn't have been much because the little amount of search I did found no stats on his high school 3 point shooting.
Since you seem to honestly not understand. I brought up Swanigan because:
-Both Swanigan and TJD were 5* recruits. Edey was ranked below 400
-Both Swanigan and TJD played the 5 as Edey, but they have/had ball handling skills Edey doesn't
-Both Swanigan and TJD are much more athletic than Edey. Something the NBA wants
The comparisons between TJD and Swanigan are much better than TJD to Edey. They are just totally different players with different skill sets and athletic leveles. I did agree that Edey would help his draft status if he developed an outside shot, but all things being equal, if Edey and TJD both shot 40% from 3 last year, TJD is definitely going first round and Edey would still be borderline.