All this fails to take into account Oumuamua not only changed speed, but it also changed direction. If someone's goal is to go from A to B, you don't want a meager gravity assist that'll add a dozen light-years to the distance you travel.<p>So, if you are driving from Santa Clara to Sunnyvale, it's not a great idea to first drive to LA to get a faster car, and then drive to Sunnyvale. In fact, it'd be faster to walk.