What does "for all you know" mean?<br/><br/><i><b>For all you know</b>, you just stepped over an uncrossable line.</i><br/><br/><i><b>For all you know</b>, he will be the next president.</i><br/><br/>Is it the same as saying the following?<br/><br/><br/><i><b>You might have not realized</b>, you just stepped over an uncrossable line.</i><br/><i><b>Maybe, although we are not sure yet</b>, he will be the next president.</i><br/><br/>Incidentally, what is the difference between <i>"might have not realized"</i> and <i>"might have not come to realize"</i>?