Haha I knew about the paint;) but I had a feeling he had some QH in him somewhere, Thank you!
All Paints have QH in them! Most registered APHAs have more or less half of each TB and QH breeding in them if you go back. This is of course very general but the true APHA ancenstors came from QHs and TBs more or less equally. Some have a bit more of one than another for example my mare has a bit more of the TB side which you can see in her refined look and yours looks to have a tiny bit more of the QH side.
Here is my mare's breeding Mystery Foolish Flirt Paint
you can see that she goes back to almost all the founding QH's...Three Bars (actually reg as both but founding to the QH breed), King, Leo, Skip W, Wimpy, Poco Bueno, and Joe Reed
Aswell as the most famous race horses of all time including Native Dancer, Round Table, Man O War(Seabisuit's Grandsire), Princequillo and Nasrullah (both Secretariat's Grandsires), Jet Deck, etc...
So your guy probably has alot of QH and TB in his bloodlines :)