BE18 LANDS OVER A SABRELINER THAT WAS CLRED INTO POS AND HOLD.

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OUR ACFT (A SABRELINER MODEL 60) WAS TOLD BY ATC (MCO TWR) TO TAXI INTO POSITION AND HOLD ON RWY 18R. AFTER REPEATING OUR INSTRUCTIONS BACK TO THE CTLR AND THEN CONFIRMING THEM A SECOND TIME; WE PROCEEDED INTO POSITION. APPROX 30 SECONDS LATER WE OBSERVED A BE18 ACFT FLY OVER US AT APPROX 30 FT AND LAND APPROX 500 FT AHEAD OF US; WE WERE LATER ADVISED THAT THE PLT OF THE BE18 THOUGHT THAT ORLANDO APCH CTL CLRED HIM TO LAND. THE PLT OF THE BE18 NEVER EVEN CHKED IN WITH MCO TWR; AND LANDED WITH NO CLRNC. ACCORDING TO ORLANDO ATC THE PLT 'WAS A PROB' FROM THE MOMENT THEY CAME IN CONTACT WITH HIM. WHY DIDN'T THE TWR CTLR KNOW THAT THE BE18 WAS BEING HANDED OFF TO HIM FROM APCH CTL? FOR AT LEAST 30 SECONDS NOBODY KNEW WHERE THE BE18 WAS. WHY WERE WE TOLD TO TAXI INTO POSITION? CALLBACK CONVERSATION WITH THE RPTR REVEALED THE FOLLOWING INFO: RPTR STATED HE CONTACTED BOTH THE LCL FAA FLT STANDARDS OFFICE AND THE TWR SUPVR FOR AN EXPLANATION. HE STATED HE HAD BEEN HOLDING ON TXWY A FOR A BE18 TO LAND AND THEN WAS INSTRUCTED TO TAXI INTO POSITION. WHILE HOLDING IN POSITION; A SECOND BE18 FLEW OVER THEM AND LANDED. THE RPTR SAID HE WAS TOLD BY THE TWR THAT THE BE18 PLT HAS BEEN A PROB TO THEM IN THE PAST. HE WAS ALSO TOLD THAT THE ACFT DID NOT SHOW ON RADAR BECAUSE HE WAS BELOW 800 FT.