for the prelim features - the top 8 in points after TT and heats are inverted. That is why both group's fast timers (Strickler and Larson) started 7 and 8. After the top 8 invert the rest are lined up straight up by TT and Heat points.
Hudson started back in the feature because even though he won his heat he timed bad. Time trial points are worth more than heat points.
Hope that makes sense.