CMH CTLR DESCRIBED POSSIBLE OPERROR AT 4000 FT WITH MULTIPLE EVENTS AS HE OR SHE WITNESSED SUPVR CTL'S DOWNWIND TOO CLOSE TO THE ILS FINAL.

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LAST NIGHT I MAY HAVE WITNESSED 3 OPERRORS IN QUICK SUCCESSION; THAT WENT UNRPTED. I WAS WORKING N RADAR. I OBSERVED FINAL RADAR WORK A BRIEF ARR PUSH; MOSTLY COMPRISED OF ACFT FED FROM S RADAR. 1 ACFT WAS A BONANZA; THE OTHER ACFT WERE ACR AND CPR JETS. FINAL RADAR HAD THE BONANZA ON A FAIRLY TIGHT (LESS THAN 3 MI) L DOWNWIND FOR THE RWY 28 ILS. I DID NOT HEAR ALL OF THIS CTLR'S XMISSIONS (NOR ANY OF THE PLT XMISSIONS); BUT I DID HEAR THE BONANZA INSTRUCTED TO TURN TO A HDG OF 110 DEGS; WHICH WAS MOST LIKELY ISSUED TO INCREASE THE BONANZA'S DISTANCE FROM THE RWY 28L LOC. I RECALL THAT THE WINDS ALOFT WERE 30 OR SO KTS OUT OF THE SW. THE 110 DEG HDG DIDN'T SUFFICIENTLY GET THE BONANZA FAR ENOUGH S OF THE LOC TO PROVIDE STANDARD IFR SEPARATION. I OBSERVED 3 JETS; ALL TRACKING THE RWY 28L LOC INBOUND; PASS THE BONANZA WITH APPROX 2 MI HEAD-ON LATERAL SEPARATION; WITH LESS THAN 1000 FT VERT SEPARATION. THERE IS A POSSIBILITY THAT THE CTLR WAS UTILIZING VISUAL SEPARATION; BUT I DON'T THINK THAT WAS THE CASE. THE CTLR ON FINAL RADAR WAS A SUPVR. HE WAS MAINTAINING HIS RADAR CURRENCY.