Statistics are important, they involve production. But look at it this way...
100 are trying to get a recording contract with a big label. 99 of them produce many recordings showing off their voice. Many of them produce excellent recordings. One person only produced a 20 second recording, but that one person was Adele. Who do you suppose will get the contract?
Maybe not the best comparison, but it is why the leading stats don't always belong to the best prospect. Then again, quite often the best prospect also has the best stats.
Regarding scouts and PG discussing prospects and sharing information. When and if a scout finds an unknown prospects, most scouts keep it to them self. That is what they should do. However, just like each MLB club, we too have scouts and contacts nearly everywhere. So unless that kid a scout saw goes into hiding, we are going to know about him. Once we know about him, everyone knows about him.
Quick story... A West Coast MLB Scouting Director is a very close friend. He had a son that was very good and played in many PG events. Because he went to some of his sons games he spotted a LHP from a remote spot in New Mexico in a 14u game. He knew the young LHP was going to be special and he stayed close to the kid for three years. He never told anyone, including us about the kid. Then one day one of our people happened to see this kid pitch. Within weeks he became one of the top prospects in baseball. Our friend, the Scouting Director, then helped us and the kid get to some big events, Area Codes and PG All American Game. Once the cat was out of the bag, the scouting director had no reason to keep everything secret. But had that kid stayed hidden, we would have seen a high draft pick that was unknown.
This year we will go over 1,000 players that we have watched at PG events and then later end up playing in the major leagues. The number of college players, all levels is well over 100,000" maybe even 200,000. Once you have seen that much talent, different size, different skill set, etc., the next time you see anything similar it sticks out like a sore thumb. Even then, we are wrong at times. Sometimes players just mature and develop beyond what we expect.
I've heard some say that scouts are wrong more often than they're right. We call those guys... "Former" Scouts!
Anyway the example of someone that gets a single every time is unrealistic. And does that mean he is not capable of getting an extra base hit? If that were the case I would choose the HR hitter because he will also get some singles and other extra base hits. More realistic, though still with many variables... Is the better prospect the HS .400 hitter with no power or the HS .300 hitter with big power? Really you don't know for absolute sure until you see both of them.