>>10989553The first two pics are the same Intercessor, but on different body molds. The first one was on the older V1-type body and the second has the V2-type, primary differences being some small changes to the articulation (especially the shoulders) and most importantly the V2 bodies are a head or so taller. This figure acted as a cheap army builder and came with a heavy bolt pistol as his primary.
The third pic is the latest cheap army builder and it is on the updated V2 body mold. It has a slight change to the coloration, the blue is a shade brighter, and the weathering is much lighter, mostly just panel lining. They also used a metallic red for the eyes, which is a nice improvement. This one comes with a bolt rifle in lieu of the heavy bolt pistol, but accessories are otherwise pretty similar.
So, nothing wrong with getting the one in your third pic; it's a good, solid figure. In my pic, the most recent version is on the far left while the older one is on the far right (with a bolt rifle from another figure, hehe). If you're in the US, the most recent version is readily available now on Amazon for about the same price as BBTS.