Your second sample is a hybrid of a rebounder/shot blocker who can pass and score from the outside. Definitely that is a unique build. Have you calculated the projected salary? He would definitely be considered because he fits both needs.
Anyways, the minimum requirements are there to remind everyone that secondaries are just as important as primary skills. If we follow that particular skill set (your first example) a 18 yr old rookie with 6-7 (average to respectable) pts in OD/ID/REB/SB can finish that player by age 23 in my estimation with a level 5 trainer (Superior). i hope you understand my hesitation. Last thing we would want is to have more people build 1 dimensional players. Not everybody will train secondary skills.
As for the Legendary rebounding, we have lost the rebounding battle to tougher teams. This has been happening for a long time. Maybe past coaches can comment to give us a wider perspective. It is an area that we need to improve on. Even in U21 we lost some close games to better rebounding teams that get extra possessions. Can rebounding be lower? If our SF/PF can have higher rebounding to offset the difference why not. Mas critical ang PF/C slot sa rebounding. Bro most of our current Centers have stupendous/colossal rebounding already. Hope I was able to address your comments. Salamat for the input.