No he wasn't the best player on his high school team. This LA Times article talks about how he wasn't consistently dominant and took a backseat to other players on his team. It also talks about people questioning the legitimacy of his high recruiting rating and McDonald's All American selection.
Your entire post, especially the part in bold, is quite the 180 and contradiction to your previous posts.
"Widely considered a lottery pick going into his freshman year."
Talk about hyperbole. He was only considered a potential lottery pick by morons like ESPN who have a vested interested in making sure Bronny is a story unlike MJ's son who quietly played for UCF and never went pro.
"NBA GMs want to see Bronny."
If he's "certainly not ready for the league," then no they don't. NBA GMs aren't putting their jobs on the line - without behind the scenes incentive - and wasting evaluation opportunities on guys that aren't even the slightest bit NBA ready. There are a number of players on the G League combine list that are more NBA ready than Bronny by quite a bit. Unfortunately for them, they don't have a nepotism card up their sleeve.
Bronny is a very talented basketball player and I don't have ill-will towards him. Based on talent & performance alone, none of us would even be talking about Bronny. The only reason he's a conversation piece is his dad making sure the spotlight is intensely focused on his son.