if I recall right inside defense is the only training that trains blocking as secundary.
Ofcourse there is a wide variety in what managers think is best.
I have trained an SF, which is splendidly balanced, yet the U21 manager feels other players, particularly SG and PFs are better to play at SF spot in the U21. Do I agree with him? no.

Likewise there will be NT managers that still feel blocking is not worth as much as other inside skills.
I on the other hand think all inside skills should be as equal as possible.
Who's right, who's not? maybe time can tell. Maybe both work out equally well.
Each manager has his own theories, and maybe this is the key to the success of BB.

Others can tell me what I should do, but in the end, I still do what I think is best. and if the U21 or the NT manager don't like it that way, and pick someone else, it's their choice. And if they ever see the light, my player will be there. ;þ
I had 2 centers. 1 with 70k wage, 1 with 45 k wage. the first had rebounding as highest skill (15), ID second highest (14), but his block was prety low (8). The other has block highest(15), and ID second highest (13), other insides at 10 and 11, so not high at all.
I sold the 70k wage center, and still have no regrets about it.
I also never would buy a center again which has blocking more then 2 level less then ID. Unfortunatly the market is full of bad shaped centers, which have high rebound and Id, but lack blocking. If you find one which has decent block skills you're lucky, if you find one who has higher block then the rest, you picked up a winning lotery ticket.
On the other hand, there aren't many managers looking to buy those rare ones, which is lucky, as otherwise they would be soooooooooo expensive.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.