the early post-block forks .
Or the block-fork post?

In theory you are right...But I'll tell you what:
Last year (October or November, can't remember) when BTG was launched I was sitting and waiting for the blockchain to come live hoping on a big profit during the first few days/weeks of mining. You know what...I didn't get rich. It appeared there were plenty of other smarty-pants doing the same thing.