I've thought that Captain America, Black Panther and Kraven are all connected for 2 decades. Am I crazy or is my theory plausible?
Erskine's formula for Cap has never been truly replicated. Other's have created similar formulas with varying degrees of efficacy, but his formula hasn't been duplicated. They've been missing a key ingredient. Cap's shield used an ingredient from Wakanda. What if the formula did too?
Sergei Kravenoff was injured while on safari in Africa. A witch gave him a potion using unknown ingredients that not only healed him, but made him FAR more formidable. We don't know any ingredients used, but Wakanda IS in Africa.
I think one of the ingredients in the formula that made Cap and the potion that made Kraven is the Heart Shaped Herb that gives the members of T'Challa's family their abilities. It would explain the similarities in their capabilities, while the differences can be chalked up to each of their formulas individual imgredients. Maybe the witch who healed Kraven was Wakandan, or at least lived close enough to find a sample of the Herb. Erskine could have gotten some when the Weapon Plus program got their hands on Vibranium for Cap's shield.
Is it plausible?