This is a good post and it was pretty comprehensive. Worth noting however, that there are many more hairy solutions Fred didn't raise.
For instance, some founders will negotiate a grant upon IPO or upon sale of a company beyond $x dollars as a way to try and align interests with investors. The problem with those is that it can cause unnatural behavior (eg, Snapchat IPO'd too soon, I'd argue, because Evan's investors gave him a grant that vested upon a qualified IPO exceeding a certain price. Or the tax issues late-breaking grants can create upon a trigger.)
For instance, some founders will negotiate a grant upon IPO or upon sale of a company beyond $x dollars as a way to try and align interests with investors. The problem with those is that it can cause unnatural behavior (eg, Snapchat IPO'd too soon, I'd argue, because Evan's investors gave him a grant that vested upon a qualified IPO exceeding a certain price. Or the tax issues late-breaking grants can create upon a trigger.)