Ok, no dupes in that MiLB Master in either the LahmanID column, or the BBRefMLBid column, so all should be well. That's where these parasites latch on to unsuspecting big leaguers. Also, shuffling down the two columns, if there are any MLB IDs, they're in both columns. I think. *Fingers crossed*
Here's your Aaron Thompson guy with the no facial hair FaceGen, and proper ID. No other Aaron Thompson came in on import, and the stats are unique to him. He's...Uh...Somewhat different in the face than he was when that FaceGen was done, as you can see here:
https://www.baseball-reference.com/p...hompaa01.shtml