1. He was just one person working on it. It probably would have happened without him.
2. Despite what you might have seen in some dramatizations, there’s no mention of him being a jerk while working at Bletchley Park.
I visited Bletchley Park Museum a few months ago, it doesn't really mention much of what happened with him at all. Which account are you referring to?
In any case, history is littered with difficult geniuses without talking about just one. Isaac Newton for example.