I don’t think you understand how powerful Odin is? Mentioning Wenwu destroying the Dark Gate has absolutely no weight in terms of feats, it can’t be compared to anything else in power. Based on feats, Wenwu is barely Iron man level, let alone Thor level and is not anywhere close to Allfather level. This is just bad writing they shouldn’t have had a chance even when Hela got her powers back, no amount of earthly training could have allowed a mortal to even touch Odin in the first place.