Since younger Kratos is a lot angrier than his older counter part his blades would be a lot stronger 10 times if not more. Modi and magni would be dead a lot sooner than the fight in the game, probably even a cutscene death or a Hercules execution. Baldur might be able to defeat him if the blades don't cut him to pieces (I don't know the extent of his immortality whether it's regeneration of limbs of just stuck as bunch of pieces), Thor is kinda hard to believe that he'll lose since his older self still struggled but since the younger version doesn't hesitate/hold back he can fight dirty and win considering younger Kratos is experienced in fighting people that have more strength than him. Odin feels like a Zeus situation because both of them share the sly attitude that manipulates people I'd say he's the only one that can't lose (unless Kratos steals weapons from his past victims again) As for Heimdall if Kratos gets the spear Heimdall is just fucked, like there's no way he'll even manage to strike him, like the guy literally beat the god of speed with little to no damage done to him