First off, I'd like to say I wish Chris Yost and his team the best of luck on Scarlet Spider. I hope they knock the book out of the park.
Having said that. Kaine is not Ben Reilly. And the more I think it over the more frustrated I become. There is absolutely no reason why after all the teasing, all of the red herrings, and all of the creative effort that's obviously gone into creating a new Scarlet solo book that this could not have been Ben. Especially since it's been established that Kaine was reborn in the same "Other" fashion as Pete. If that's truly the case, Ben could've been reborn as well assuming it's a genetic effect. He was the perfect clone and he disintegrated when he died, why wouldn't Kaine's body do the same after the Grim Hunt? Now his scars are gone, he's the same height as Pete, he's cracking jokes and fighting side by side with a man he seemingly hated as recently as the "Who Was ben Reilly?" arc.
I think it's absurd. There's a very vocal contingency of fans who for 15+ years have been clamoring for Ben's return, and they decide to tease that return to death only to try and convince us that Kaine and Ben are one and the same? Why not just give those fans what they want? Why twist the knife further? Ben Reilly is just as viable a character as Kaine, and I see no reason why the decision was made to give Kaine this book rather than Ben.
Kaine is not Ben, Ben is not Peter. Bring Back Ben.