Mustang losses 31.08.44 in Romania/Hungary

[kaki3152]

I've always been interested in this combat, especially after buying Lipfert's book.
I did not know Lt. Carlson was not killed as the after action report of the 52nd FG reported:
"Lt. Carlson was last seen about 15 milesSW of the airfield at 4640N 2430E at 1035 hrs. It is believed that Lt. Carlson was in the plane seen by Capt. Ohr to be attacked by E/A over the A/D and crash on the field. Capt. Ohr identified this plane as a P-51. It is not believed that this A/C was the one flown by Capt. Davis who crashed fifteen minutes earlier. Aircraft No. QP-X"
The sortie statistics show the following:

" 48 P-51s took off from Madna at 0740 hours. Four airplanes returned early (three mechanical and one spare)44 airplanes were over the target at 14,000 feet to deck at 1005-1035 hours. One plane was lost, three are missing. 39 airplanes landed at Madna at 1335 hours. One landed at 1435 hours after refueling at Vis. One plane crashed on landing ; plane destroyed, pilot slightly injured."

SInce Lt. Carlson was not a casualty, he must have been an evader. Can anyone shed more light on this?

Also, how was it determined that Lt. Fonnekold shot down three Mustangs as reported in Obermaier "Ritterkeuztrager:Jadgflieger"?