I always felt that Kraven is a older, experienced villain. He is big like Butler, but ATJ can bulk up. Supposedly, Sony went after Pitt, Reeves and Driver.
Yeah, Kraven was always in his 40s or so, considering he has teen/YA kids. But he's always had the agility/body of a peak man, so it makes sense getting someone in their 30s. Butler is closer to the type, I'll agree there. But we have to be realistic. You'll need tons of shots of Kraven naked/semi-nude fighting in jungles, and aside from Statham who was an Olympic athlete before becoming an actor, I can't think of many 50 YOs who could pull that off. The only way to make a good Kraven flick is to pull off the action.
As for the rest, I can't see them as Kraven. Driver has the most mass, plus the voice and the acting chops, but he's more selective in his roles. I do hold some hope that he'll be getting Doom, but it's a longshot. I'm looking forward to all of his films, truth be told. Gucci, Annete, The Last Duel, they all look and sound great, especially in this Post-Covid era.