I just tried this, pitching a fresh wort into the empty bucket that I just racked from. It was planned but did not execute well, the timing was rushed and I realized at the last moment that the primary I was emptying was a black IPA! Holy dark before light, Batman. It was too late at that time so I guess we will see what becomes of my pale ale wort. I will try to report back. In the future I hope to always take time to clean the collected yeast, at least a little and then make a starter. Still, this hobby has unlimited opportunities for discovery.