ACR X HAD NMAC LTSS WITH SMA AFTER TKOF. EVASIVE ACTION TAKEN. SYS ERROR.

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PRIOR TO THE INCIDENT; WE HAD 2 ACFT (CESSNA AND CHEROKEE RESPECTIVELY) INBOUND FROM SW FOR R TFC TO RWY 19R. AN A320 WAS IN POS ON RWY 19R AWAITING IFR DEP BEHIND A C210 THAT HAD PREVIOUSLY DEPARTED IFR. SINCE WE NEEDED MORE SEPARATION BEHIND THE C210; MY DEVELOPMENTAL SWITCHED ANOTHER CESSNA (WHO WAS ON R DOWNWIND) FROM RWY 19R TO LAND ON RWY 19L (VIA R BASE). AT THIS POINT; THE DEVELOPMENTAL INSTRUCTED THE CESSNA INBOUND FROM THE SW TO 'CROSS OVER THE ARPT FOR L DOWNWIND RWY 19L.' HE ALSO INSTRUCTED THE INBOUND CHEROKEE TO FOLLOW THE CESSNA AND DO THE SAME. THE CHEROKEE RPTED THE CESSNA (WHO WAS AHEAD OF AND SLOWER THAN HIM); IN SIGHT. IN THE MEAN TIME; THE A320 WAS CLRED FOR TKOF ON RWY 19R. DURING THIS TIME; I OBSERVED A CESSNA INBOUND FROM APPROX 3 MI SW OF THE ARPT. THIS ACFT WAS ON LCL CTL #2'S FREQ INBOUND FOR RWY 19L. (RECALL THAT WE HAD RWY 19L FROM LCL #2; HOWEVER HE RETAINS HIS FREQ). THE LCL #2 CTLR RECOGNIZED THAT OUR #2 ACFT WERE COMING OVER THE ARPT FOR 19L AND INQUIRED FROM THE DEVELOPMENTAL WHAT HIS PLAN WAS (REF HIS INBOUND TFC). THE DEVELOPMENTAL INDICATED THAT HIS ACFT WERE IN FACT GOING OVERHEAD THE ARPT TO JOIN THE L DOWNWIND. AT THIS POINT I INTERJECTED THAT HE (THE DEVELOPMENTAL) NEEDED TO BE SPECIFIC IN HIS COORD AND TELL THE LCL #2 CTLR WHAT HE WANTED. THE DEVELOPMENTAL THEN TOLD THE LCL #2 CTLR TO 'FOLLOW' THE CHEROKEE. (I.E. HAVE HIS ARR FOLLOW IN BEHIND THE CHEROKEE GOING OVER THE ARPT). I COULD SEE THAT HIS PLAN WOULD NOT WORK WITHOUT SOME MANEUVERING BY THE INBOUND SW CESSNA; AND THE LCL #2 CTLR ALSO RECOGNIZED THIS I'M SURE. THE LCL #2 CTLR RPTED THAT HE WOULD FOLLOW THE CESSNA; WHO AT THIS POINT WAS TURNING L DOWNWIND FROM THE OVERHEAD XWIND. THE DEVELOPMENTAL THEN TURNED THE CHEROKEE TO A HEADING OF 150 DEGS SO THAT IT WOULD FALL IN BEHIND LCL #2'S CESSNA (I DID NOT HEAR THIS XMISSION AT THE TIME; BUT LEARNED OF IT IN THE OJT DEBRIEF SESSION FROM THE DEVELOPMENTAL). I NEXT HEARD THE CTLR IN CHARGE WARN US TO WATCH OUT FOR; OR SOME SUCH STATEMENT TO CHK THE UPWIND. I LOOKED UPWIND AND OBSERVED THE CHEROKEE HDG E OR SE ABOVE AND TOWARD CLBING A320. I REMEMBER CHKING THE DBRITE FOR ALT. I BELIEVE THE CHEROKEE SHOWED 1400 FT AND THE A320 1000 FT. I SAW THE CHEROKEE PASS AHEAD OF; ABOVE AND TO THE L OF THE A320. I SAW THE A320 MAKE A SHARP BANK TO THE R. IT APPEARED THAT THIS OCCURRED AFTER THE CHEROKEE HAD ALREADY PASSED. THE DEVELOPMENTAL THEN INSTRUCTED THE CHEROKEE TO TURN L TO THE DOWNWIND TO FOLLOW LCL #2'S CESSNA. (AFTER THE CTLR IN CHARGE BROUGHT OUR ATTN UPWIND; THE DEVELOPMENTAL ISSUED TFC TO THE CHEROKEE; 'AN A320 DEPARTING;'AND THE CHEROKEE RESPONDED 'LOOKING.' THE A320 HAD JUST BEEN SWITCHED TO DEP CTL AND WAS NOT ON FREQ). THE PLT OF THE A320 FILLED AN NMAC RPT THE FOLLOWING DAY. SUPPLEMENTAL INFO FROM ACN 295221: SHORTLY AFTER TKOF FROM SNA ON THE MUSSEL 5 DEP AT APPROX 1000 FT; I SAW A SMALL ACFT ABOVE US AND VERY SLIGHTLY L. THE ACFT APPEARED TO BE ON A S HDG. THE FO WAS FLYING AT THE TIME AND I YELLED 'TFC' AND POINTED TOWARD THE ACFT. AT THE SAME TIME WE BOTH PUT IN CTL AND MADE AN AGGRESSIVE TURN TO THE R. I WOULD ESTIMATE WE PASSED WITHIN 200 FT OF THE TFC. I NOTIFIED SOCAL DEP CTLR; WHICH WE HAD JUST BEEN SWITCHED OVER TO; THAT WE HAD JUST HAD A NEAR MISS WITH A SMALL ACFT. THEY ASKED IF SNA TWR HAD GIVEN US ANY TFC AND I REPLIED NEGATIVE. THERE WERE NO TFC ADVISORIES FROM EITHER TWR OR DEP CTL OR TCASII.