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There's no such thing as "too early in the story for a plot twist". There's even a trope called "First-Episode Spoiler", for when the very beginning of a story contains a plot twist that's pivotal ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43190 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There's no such thing as "too early in the story for a plot twist". There's even a trope called ["First-Episode Spoiler"](https://tvtropes.org/pmwiki/pmwiki.php/Main/FirstEpisodeSpoiler), for when the very beginning of a story contains a plot twist that's pivotal to the rest of the story (obligatory TV Tropes warning). In your case, where you've got the parallel journeys, you could write them in such a way that the first hero _seems_ virtuous and strong-willed up until his corruption, but once you read the second hero's journey, you realise just how much more virtuous and strong-willed he is in comparison. This way the first hero's journey will still come as a shock to most readers, but as they read on, they'll realise in hindsight that it's actually not all that unexpected.