Jelme,
I hope you are up for some friendly debate because I think there's a few things we may disagree on.
I don't think training a SF for the U21 team is impossible, I just don't think its encouraged! I think we tend to promote training PGs and C's and then fill out a 5 position roster with an imbalance of converted PGs and Cs. But if you think about, you are naturally going to get a dominant center (or 3) and a dominant point guard (or 3), so why not focus on training the weaknesses?
There's a few guys in the NT database that are 21 and are fairly close to being ideal SFs. Now I can't see their heights, but I would guess at least one of them has the size to play the position.
Personally I think the SF position is one that requires more balance and less specialization. My post Nigel Marcus is a highly specialized post with over indexed IS, ID and REB. But it cripples my game style because he's so one dimensional. I'm pretty easy to scout. I'm likely to play LP or LI a majority of the time, and I see a lot of 2-3. I learned quickly to balance out my attack with shooters to take the pressure off and keep the defense honest. The only problem? I focused so much on the JS and JR categories that I ended up with a team that had no handling because everybody only trains the sexy categories.
Which leads me back to my point. . .I think you can still focus on single position training a SF. OS, HN, Pressure, ID, SB and Passing all allow for single position training. And all are valuable skills for a SF to have.
But I don't think this discussion is about our philosophical differences about the SF. I think its more about strengthening the program. . .something we are both committed to.
You once replied to one of my previous posts in the forums that this is a strategy game. I believe it was a training discussion about developing bigs. You also said that you would hesitate to encourage your friends to train for the NT because of the salary impact. Why aren't we communicating this upfront? Training an NT player is a 3 season (minimum) commitment. When I started this process I was a D5 team with no revenue, a basic trainer, and no concept (or mentor) to help me in developing my player. No one reached out to me. I reached out to Burlington Mountain Goats and a few of my friends for guidance. They told me to single position train and get a good trainer. That was it.
I completely agree with you that this is a strategy game. The top teams can play motion, RnG, PTB, low post, look inside, and they vary their defensive looks and change up their rotations. They do this based on matchups, game shape, training progressions, or even just a deep down gut feeling based off of their research of the opponents tendencies. Look at the Philippines this year. In their first 5 games they played 4 different styles. That's 4 different offensive AND 4 different defensive styles. Something I think we could have used more of last year.