A CTLR-IN-CHARGE AT SJC WITNESSED A B737 ON SHORT FINAL GO AROUND BECAUSE A B737 WAS DELAYED SLIGHTLY ON TKOF.

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THE FOLLOWING EVENT OCCURRED WHILE I WAS THE CTLR IN CHARGE AT SJC INTL ARPT ON MAR/XA/00. WE WERE WORKING TFC ON RWY 12R. ALTHOUGH WE HAD SOME RAIN AND HIGH WINDS EARLY THE WX WAS CLR WITH 10 KTS OF WIND AT THE TIME OF THE INCIDENT. LCL CTL ISSUED A TKOF CLRNC TO ACR X WHILE A CHALLENGER; ACFT Y; WAS ROLLING OUT ON RWY 12R. THE ACR X HAD 1 TURN TO MAKE AND ABOUT 300 FT OF TAXIING LEFT WHILE THE CHALLENGER ACFT Y HAD 700 FT OF RWY LEFT TO TAXI. ALSO; ACR Z WAS JUST INSIDE 3 MI FINAL. WHEN ACFT X MADE THE TURN ONTO THE RWY; HE CAME TO A COMPLETE STOP AS I BELIEVE HE SAW CHALLENGER; ACFT Y; JUST STARTING HIS EXIT TURN. AS SOON AS ACR X STARTED HIS PWR UP IT WAS OBVIOUS THAT SEPARATION WAS NOT GOING TO EXIST BTWN ACR X AND ACR Z. WHEN ACR Z HAD ABOUT 1000 FT LEFT TO THE THRESHOLD HE INITIATED A GAR. IF HE HAD LANDED A LOSS OF SEPARATION WOULD'VE OCCURRED. THE LCL CTLR SHOWED POOR JUDGEMENT TWICE IN THIS INCIDENT. FIRST; HE SHOULD HAVE NEVER CLRED ACR X WITH THE SPACING AVAILABLE. 3 FULLY CERTIFIED CTLRS WITNESSED THE INCIDENT AND ALL AGREE. SECONDLY THE CTLR SHOULD'VE SENT ACR Z AROUND ON HIS OWN MUCH EARLIER. BY WAITING THE LCL CTLR ALLOWED THE ACFT TO COME A LOT CLOSER TO ONE ANOTHER THAN WAS NECESSARY.