You can find it on various episodes of the locked on bills podcast where Joe Marino speculated on it locked on bills episodes that include Jerry ostrowski and Jeremy white. He references some statements mcdermott has said in various pressers and that he said you barely see the two together(training camp. It's just speculation reading into statements from mcd and I think Beane as well in pressers.
Could be true OR it could be two guys at the top of the org working together 10 years, with immense pressure they put on themselves, and the pressure of finishing the job. After 10 years, with this kind of expectation and money that there are bound to be moments of disagreement and tension. I think if there wasn't at times after all this time etc etc I'd be more concerned.
It's not like rexy throwing Roman under the bus, or Greg williams and their OC at the time, actually trying to get rid of the other lol
This