Yeah, I have that book, It's got quite a few discrepancies, I also have the sister book for Groups. It shows this tiger over shield design as the 23rd Fighter group. Also, Tex wore this patch as commander of the 23rd FG and he was commander of the 75th FS. I'm thinking some info got lost or confused along the way. Can't pinpoint them, but like I said, some info in the books is misleading.
Yes, the 23rd and the 14th are the most maddening of all the units in WWII. The late great R.T. Smith, spent most of the rest of is life trying to inform people that neither the 23rd or 14th were true Flying Tigers, only the 311 men and women that served with Chennault between, July 4, 1941 to July 4, 1942 were! Although, I just noticed, the modern 75th, call them selves Flying Tigers.