WHILE WORKING AN EMER SIT; FAT APCH MISSED 1 OF 2 ACFT AT VIS RESULTING IN NMAC.

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AFTER INTERCEPTING RWY 30 LOC AND CLRED FOR THE ILS; INTERCEPTED GS APPROX 1 MI OUTSIDE OF OM AND STARTED DSCNT AT 160 KTS. FAT APCH CALLED TFC ALERT AT LESS THAN 1 MI. WE SAW BE90 IN FRONT OF US WITH GEAR EXTENDED ON LOC. TURNED R 30 DEGS AND DSNDED TO PASS ON R (TO KEEP HIM IN SIGHT). FAT APCH CALLED ANOTHER ALERT AT OUR 1 O'CLOCK POS 2 MI. TURNED L; INTERCEPTED LOC ABOUT 1 MI AHEAD OF BE90; CONTINUED APCH. FAT TURNED US OVER TO ADVISORY FREQ. AT APPROX 2 MI FINAL; ADVISED LCL TFC AND LANDED. AFTER PARKING ACFT; BE90 PLT CAME OVER AND COMPLAINED WE CUT HIM OFF ON THE APCH. HE STATED; 'HE WAS CLRED FOR THE APCH BEFORE US.' AFTER DISCUSSING THIS MATTER IT WAS DETERMINED THAT FAT WAS VERY BUSY AND HAD A POSSIBLE EMER IN PROGRESS AND SOMEHOW MISSED ONE OF US. IT TURNS OUT BE90 PLT WAS AN FAA POI AND WAS FLYING THE ACFT DURING A CHK RIDE. HE SAID HE WAS GETTING COPIES OF THE TAPES AND WANTED A WRITTEN STATEMENT. HE NEVER ASKED TO SEE MY CREDENTIALS; EVEN AFTER I REQUESTED A 'RAMP INSPECTION.'