Count, that lower pattern is cool indeed... I ripped that bar to use for explosion edges but if anything it should have been welded on after the other bars were welded and profiled, to keep it from being drawn out and thinned as much as it was from being on the edge of the billet, feeling the hammer.
The pattern has areas where carbon content and alloy content do interesting things. For this blade in particular I experimented with a cast iron-bearing flux that's quite aggressive, to both dissolve any trapped scale from the "crimping" of the snake bars and add some high-carbon material to promote welds and solidify areas that might otherwise be scale pockets. The areas where you can see this, i.e. at the meeting points of some of the ends of the folds, etch a bit different than the surrounding 1080 and 15n20. In some spots you can see where the edges of those burnt out a bit and lost some carbon, becoming silver again. These billets are a right bastard though to weld up solid, so when grinding they won't have the perfect monosteel appearance before etch, rather having some flux lines. After a deep etch, it's all parkerized together, which seals the surface well but etches the iron-flux areas a bit different.
I'm going to experiment next with adding these snake bars to canoe type packets and shaking full of 1084 powder on both sides, then welding dry/oxy free to try to get a more perfect steel. But that's after I get my big hammer rebuild and can use those monster flat dies.