2 added 322 characters in body
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very simple?
I would just use the code and refactor/rewrite parts of it that need a change whenever it's necessary.
You don't need to rewrite all his code if it just works.

Edit:
Coming to think about the fact that he may be THAT Kind of coder,
There may be a few solutions that may be impractical but they may be worth mentioning:
1.hire an ex-coworker of his that knows his coding style.
2.hire someone that doesn't comment his code, this kind of people understand each other best.

very simple?
I would just use the code and refactor/rewrite parts of it that need a change whenever it's necessary.
You don't need to rewrite all his code if it just works.

very simple?
I would just use the code and refactor/rewrite parts of it that need a change whenever it's necessary.
You don't need to rewrite all his code if it just works.

Edit:
Coming to think about the fact that he may be THAT Kind of coder,
There may be a few solutions that may be impractical but they may be worth mentioning:
1.hire an ex-coworker of his that knows his coding style.
2.hire someone that doesn't comment his code, this kind of people understand each other best.

1
source | link

very simple?
I would just use the code and refactor/rewrite parts of it that need a change whenever it's necessary.
You don't need to rewrite all his code if it just works.