Its silly to think that any of those scenarios are absolutely going to happen if you house the snakes together. Nothing might ever go wrong. No one can say for sure.
Personally, I house my animals in separate enclosures because I believe they prefer being alone. There really aren't any benefits to the animals health or overall well being that are convincing enough to house these animals together. They just like being alone.
Can you house them together? Sure you can. But just be aware that there are some negative consequences associated with housing together. Ask yourself "why am I housing them together? How does this enrich their lives?"
If you do, I would only ever permanently house females together, as two sexually mature males will combat. Having a male and a female together could create an unplanned clutch of eggs that you and the female snake might not be prepared for.
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