OPERROR PLT DEV -- CPR Y PASSED OVER ATX X HOLDING IN POS AND LANDED THE SAME RWY.

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JET STAR; CPR Y; LANDED OVER TOP OF ATX X HOLDING IN POS RWY 27. AT APPROX XX10 UTC; THE QUICK LOOK PATCH THAT CTLED THE TRANSFER OF THE ARTS DATA BLOCK ASSOCIATED WITH ARRIVING ACFT LNDG LINDBERG FAILED ON THE D-BRITE RADAR AT LINDBERGH. I INFORMED THE CABIN SUPVR OF THIS. AT XX22 UTC; A TFC WATCH CESSNA CALLED REQUESTING TO PROCEED NBOUND ON INTERSTATE 805. I RADAR IDENTED THEM SE OF THE ARPT AND APPROVED THEIR REQUEST. AT XX24 UTC ATX X CALLED READY WHEN YOU CAN RELEASE US. THEY HAD A LOS ANGELES FLOW CTL RELEASE TIME OF XX27 TO XX29 UTC SO I INSTRUCTED THEM TO HOLD SHORT OF THE RWY. AT XX25 UTC INSTRUCTED ATX X TO TAXI INTO POS AND HOLD. AT XX25:18 UTC; I OBSERVED A RADAR TARGET WITH A TRAILING 'S;' (THE 'S' INDICATES THE TFC WOULD LAND AT LINDBERGH) TURNING ABOUT A 3.5 MI; HIGH AND FAST R BASE FOR RWY 27. THE TFC WATCH ACFT NOW BECAME CONFLICTING TFC FOR THIS ARR; SO I INSTRUCTED CESSNA TO MAKE A R 180 DEGS TO KEEP SEPARATION. AT XX26 UTC THE JET STAR; NOW IDENTED; RPTED VISUAL RWY 27. I TOLD THE JET STAR YOU'RE ON A 2 MI FINAL CLRED TO LAND. THEY REPLIED; 'THAT US.' THERE WERE A COUPLE OF OTHER XMISSIONS TO TFC WATCH ACFT OPERATING IN AIRSPACE. AFTER THESE CALLS; I HEARD ATX X SAY YOU DID TAXI US INTO POS. AT THAT TIME I REALIZED THAT I HAD FORGOTTEN ATX X ON THE RWY. I FEEL THAT THE FAILURE OF THE AUTO TRANSFER OF THE ARTS DATA BLOCK ASSOCIATED WITH ARRIVING ACFT; THE SHORT AND FAST APCH THE JET STAR MADE AND TRYING TO INSURE SEPARATION BTWN THE JET STAR AND THE TFC ACFT DISTRACTED MY ATTN LONG ENOUGH THAT I FORGOT ABOUT TFC HOLDING ON THE RWY. AFTER THIS EXPERIENCE; MY SUGGESTION IS THAT DEP TFC SHOULD NOT BE TAXIED INTO POS AND HOLD FOR ANY TYPE DELAY REASON; SUCH AS FLOW WINDOWS OR WAKE TURB.