Last year West Virginia signed 4 juco players and they got 18.5 ppg out of them.
Texas Tech signed 2 juco players, and one of them became their leading scorer. Not a good team though. Their second leading scorer is also a juco player. 20+ ppg from juco players.
Baylor had 3 juco players last year and got 22.5 ppg out of them. Good production.
Iowa State has 2 jucos and got 12.5 ppg out of them.
Nowadays jucos typically fill roles, gaps, etc. You can get 3pt shooters out of juco, slashers, rebounders, defenders, role players, older guys, etc. You don't see too many well-rounded juco players that come in and act as your best player or best overall talent.
Mike Neal is a great example... that guy was an awesome 3pt shooter. Couldnt do much else, but he could shoot the lights out. Patillo had a lot out of potential to be good, and could have filled a role. Crazy athlete.
I am sure Manyang will be a good defender, shot blocker, and just be tall. I will be curious to see how he does compared to Anthony Allen from Oklahoma State.
McKay was a top 100 4* recruit. Stop using him as an example.
Texas Tech was dead last in the big 12. Not a good example.
Baylor has done quite well with Jucos. No denying that.
No one has said there isn't any talented juco players. You can pull up the list of top 50 juco players each year recently and more fail than succeed. Its a simple, wait and see approach. Manyang might be a stud or he might be what Allen was for OSU. Who knows.