CTJ wrote he thinks the source is Jerrah and that's as good a guess as any. In fact, I'd say it seems very likely. For several reasons, the source was almost certainly an NFL owner or someone in their close circle. We can also surmise it's definitely not Sexton nor a bmd for the simple reason it's in none of their interests to leak that info about Sark at this point in the season. The reporter who got the quote about Sark also wasn't around a bmd nor Sexton last week, however she was at the NFL owner's meeting. 
 
	The original NYT report is by now pretty well buried on The Athletic site but it was written by a reporter whose job is to cover the NFL. She covered last week's NFL owner's meetings and that's where someone apparently gossiped to her about Sark looking for an NFL job. Jerrah is well-known to be a big gossip. The line about Sark is but one sentence at the end of a longish article - maybe 1000 words, all about the NFL except for the Sark mention.
 
	The reporter dropped the "I'm told..." about Sark in the context of discussing what certain NFL owners are saying about their own teams and the league. The use of "I'm told" means she had but a single source. If she had more than one source, she and her editor would have printed that. Her article not only quotes Jerrah extensively about NFL matters, the reporter also wrote about him very favorably - some would say even fawningly.
 
	The rule of thumb when there is an unnamed source is that you can almost always find them quoted elsewhere in the article and that person will be treated favorably within the article. And then you have to analyze who would be motivated to make the statement AND ask for non-attribution. The rule of thumb applies to the Cowboys owner on all counts.