It would be useful for you to understand what this is referring to. These "weights" are how the team rating of rebounding is determined. There is no need for the number to be one. It just means that the skills taken into account to create the rating which shows up on the box score of your page use this formula: (just an example- not anywhere near what the actual formula is) PGx + SGx + SF(x+y) + PF(x+y+z) + C(x+y+z). The total skills that are factored into the team rating are then modified by position, with the C and PF modifier being greater than the Sf which is greater still than the guards. Or at least that's how I understand it.
Even in your anecdote, all the children in Lake Wobegone could be above average if all the children in St. Olaf are below average.
Once I scored a basket that still makes me laugh.