Yea man, I'm with you on this logic. This was the same thing I was thinking when those signature skills were introduced. I haven't read through what everyone else is saying, but it seems to me that some of this skills are already in 2k12, especially since we can alter everything about player from ratings to tendencies.
I think it is a good start but it will probably won't be until 2k14 that the whole aspect of signature skills are fined-tuned.