Sal answered that question in that very thread I believe, saying that the makers of the value line were learning to work with CTC BD1. But I am wandering, why would they change their formula unless it would not affect cost? You are talking about the ''value lines'' or ''entry level'' if you will. For the price range, 8Cr13MoV is providing very good performance. With the heat treat on my Caracara2, 8Cr13MoV blows away 420HC for edge retention while doing a little wood work in my experience, but 420HC is a good kitchen steel IMO and I like it as such. A couple of passes on my Lansky 4 Rod Gourmet Knife Sharpener and 8Cr13MoV is back to shaving sharp like under a minute. For a real Spyderco using a liner lock(presuming that is what your looking for) and near the size of the bird crow, check out the Spyderco Cat and the Spyderco Sage 1
Man I want that sage 1 in my collection I think...so many of their models in fact!