So Hogasm, that job sequence musta gave credence to the Fish and chitps phrase, or what that chips.... I can't remember
Doesn't' the request for a legit answer have the false assumption that the original question
was in fact legit to begin with? 
I sometimes wonder why people come up with that question about the small amount of "dirty" oil left in the engine (
bet it's got a lot to do with all the advertising for that several hundred dollar gizmo you see in all the bike mags), but I've never seen anyone ask what they should do about that possibly dirty and stale gasoline still in the tank when they fill up. Should we pull off the fuel line and pump the left over gas out on the ground first? I'd hate to contaminate my brand new tank of high test with "old" gas.
Seriously, if someone is all that worried about a few ounces of used, not necessarily dirty, oil remaining in the crankcase, then it's quite simple to drain the actual crankcase after the oil in the top end has drained down. There is a plug that can be used for that purpose. Then add a couple quarts of oil, fire the bike up and let it idle for a couple minutes, drain the oil again. Fill with fresh oil and that's about as "fresh" as it's going to get. And you don't need to buy that special plate in those ads to do it.
Of course, the smartest approach is to not be so anal and just accept the fact that a small amount of used oil has always remained in engines when doing oil changes, and it has never proved to be a problem over the hundred plus years we've been running internal combustion engines in vehicles. Save the worrying for the important chit.
Jerry