Just would like to say this right here, speaks of an experienced manage who's been in top leagues for a while.
It's pretty apparent that managers in the top competition look for secondary attributes (on top of a good primary attributes) while managers in lower leagues prefer primary attributes quite a bit more.
as to the original topics of this thread, I think the OP mixed several different questions into one thread: it's one question to ask what attributes should be looked for for your center on the offensive end, another question to ask what attributes should be looked for on the defensive end, and then a totally different question regarding why players designated as "C" in TM doesn't score as much as expected. each of these questions could lead to interesting discussions, but mixing them up usually makes the whole discussion unfocused