No, Haynes did not fly all of the first 25 Thumper missions. As an example, there is a diary of Carl Barthold from the J. M. Campbell crew here:
http://www.497thbombgroupb29.org/per...ld,%20Carl.pdf
On page pdf page 8, he describes a mission they flew on A-21, Thumper on 15 February, 1945 to Nagoya. He mentions that R. G. Didier got an "Irving" on the mission.
In this photo of the the Campbell crew in front of Thumper that Nagoya mission with a kill flag is shown as mission number 18 of the 20 missions shown.
http://www.497thbombgroupb29.org/ima...%20A-21%20.png