If you look at a freshman or even sophomore who got little playing time, sometimes he becomes a full time player in subsequent years, sometimes he stays on the bench, sometimes he changes positions and plays more, sometimes he transfers or quits.
No amount of studying the rosters will tell you which outcome will happen to which kid.
No amount of studying the stats will tell you which outcome will happen to which kid.
If you could attend every practice, particularly in the fall, you might get a good idea, but that's not going to happen.