My opinion: 4/4 is ok, but u have to put those 4 who qualify with season score higher than those 4 who are qualified from overall score. It's seasons playoffs, not overall playoffs, if u know what i mean, right? (maybe it already is so, i haven't looked at the current situation).
Another thing - imagine the situation when someone reaches both criteria for playoffs (first in a season and first overall). We need to determine by which of them that player enters the playoffs.