Not sure I'd call Kraven A-list despite the great amount of respect that Kraven's Last Hunt has.
Regardless, all Spencer did was create a Kraven that writers can use without feeling like they are trampling all over KLH. I'd be willing to bet Slott and Spencer weren't the only writers who were unhappy that Kraven was revived in the first place, and I'm sure any writers would have absolutely no problem using the new Kraven clone.