PA28 QUESTIONS LNDG CLRNC AS TWR CLRS A C172 TO TAXI INTO POS FOR OPPOSITE DIRECTION TKOF.

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LNDG AT LOU; VISUAL APCH RWY 24; IFR FLT PLAN; VMC; ATIS RPTED VISIBILITY 4 MI HAZE. LOUISVILLE APCH TELLS ME TO EXPECT RWY 24 AT LOU; THAT THEY HAVE RECENTLY CHANGED RWYS FROM RWY 6 TO RWY 24 (LOU ATIS NOT YET UPDATED). HANDED OFF TO LOU TWR. LOU INSTRUCTED ME TO 'ENTER THE PATTERN; RWY 24.' I ASK FOR A R BASE ENTRY TO CLARIFY. TWR APPROVES THAT. NOTHING FURTHER HEARD FROM TWR TO ME UNTIL I INITIATE IT. AS I ENTER THE PATTERN; I BECOME AWARE OF A DISCUSSION OCCURRING BTWN TWR AND AN ACFT WAITING TO TAKE OFF. I CAN CLRLY SEE 2 ACFT HOLDING SHORT OF RWY 24. TWR INSTRUCTS THE ACFT TO 'TAXI INTO POS AND HOLD.' I SEE NOTHING HAPPENING. I CONTINUE THE VISUAL APCH; AT THIS POINT ABOUT 1/2 MI FINAL RWY 24. THEN I SEE A CESSNA TAXIING INTO POS ON RWY 6. I IMMEDIATELY SAY TO TWR; 'AM I CLRED TO LAND?' TWR TELLS CESSNA TO TAXI OFF RWY 6. AS I CROSS THE NUMBERS; JUST ABOUT TO ADVANCE THE THROTTLE FOR A GAR; AND AT ABOUT 50 FT AGL; I AM CLRED TO LAND. AFTER LNDG; I OBSERVE A TKOF OF THE CESSNA FROM RWY 6 STRAIGHT INTO A LNDG ACFT ON RWY 24. FROM MY PERSPECTIVE AT THE FBO; IT IS DIFFICULT TO TELL HOW CLOSE THE 2 ACFT CAME. WERE I THE PLT OF THE LOW WING; I WOULD HAVE BEEN UPSET. TWR USED UNCLR INSTRUCTIONS. HE DID NOT SAY 'RWY 6.' HAD HE; I WOULD IMMEDIATELY HAVE BEEN CLUED INTO A POTENTIAL CONFLICT A CRUCIAL 20 SECONDS EARLIER IN MY VISUAL APCH. TWR DID A POOR JOB MANAGING A SINGLE PIECE OF PAVEMENT. HE LOST SITUATIONAL AWARENESS OF MY INBOUND. HE QUITE POSSIBLY CAUSED A SAFETY ISSUE WITH THE RWY 6 OUTBOUND AGAINST THE NEXT RWY 24 INBOUND. FROM MY PERSPECTIVE; A CHAIN OF EVENTS HAD STARTED HERE THAT COULD EASILY HAVE ENDED WITH 2 ACFT COLLIDING. IT IS QUITE POSSIBLE MY INQUIRING OF TWR; WAS THE ONE THING THAT BROKE THE CHAIN AND FORCED ONE OF TWO RIGHT DECISIONS TO BE MADE.