I've never trained blocking for defensive players. It usually goes up quite a bit when you train tackling and agility anyway, but what use would a defesive lineman have for blocking?

Unless you dual-role players, it's surely not worth training for defenders.

Let me try to explain this a different way...

Many people seem to believe that STCB uses Blocking as a primary skill because they perform a "blocking" function in the game engine. However, there is no STCB position on your roster. Therefore, the STCB position must employ primary skills from the CB position.

I don't believe the game engine is sophisticated enough to create its own STCB position during the match and pull a different set of skills for this purpose. Therefore, it must be employing the same skills denoted as "Primary" and "Secondary" skills for the CB, which means Blocking would have to be included in this skill set and would have to be used in the game engine for the CB position also.

Deductive reasoning dictates that this is a logical conclusion to make.

If you look at it further, the devs *could* have said that "blocking" is also a way for defensive players to defend against the pass. Since there is no "pass defense" skill, it is logical to think that CB's trained in blocking also uses this skill for that purpose. You could take it a step further and apply this thinking to any defensive player that defends against the pass.

This is just a fun exercise in applying rational thought to an irrational game. haha

I also think the Admins being purposely vague and non-specific on this topic give more credence to this notion because the lack of flexibility in the game engine means they had to do it this way, but they won't admit it.

At one point, when admin were answering questions (yes, a very long time ago), Admins pretty much stated that CB and STCB used the same skills except, STCB used Blocking instead of Tackling.
So there is suppose to be a difference in the game between them other than just when they lineup.