Ugh. Small != Venom. I hope Brock bulks up in SM4.
One of the things that I always loved about Venom was how accidental it was. Brock was mad at Spider-Man for ruining his career and marriage (it was on the rocks already, but the Sin Eater hoax just axed it), and the nearly-dead symbiote could feel it. But it wasn't prepared for the onslaught of just how deeply Brock felt and that drove it over the edge, which, because they were connected, dragged Eddie with it and turned them (accidentally) into the massive, mean, insane Spider-killing machine that they were.