In Flex and Fastbreak I gladly will put a SF with decent rebounding at pf and c. However, although a team with all sf's might be decent, I firmly believe the most important position in any offense is a pg. If you only have an average point guard, it will be very hard to have an elite team, and if we are talking about DIII, to find a small forward that has ratings in the 60's in BH and PA is extremely rare.