Give the player id of the man who had the most turnovers whose team missed the playoffs in year 1988.
the most turnovers refers to max(turnovers); missed the playoffs refers to PostGP = 0; in year 1988 refers to year = 1988
SELECT T2.playerID FROM players_teams AS T1 INNER JOIN players AS T2 ON T1.playerID = T2.playerID WHERE T1.PostGP = 0 AND T1.year = 1988 ORDER BY T1.turnovers DESC LIMIT 1