Just means he's conditioned for the NFL already and may not hit that massive wear down point that most rookies hit later in their first year.
As for the Cowboys (other posters noted they weren't listed) It's pretty much obvious Jerry Jones massive interest, and given the history of not really caring about character flaws (Dex Bryant for example), throwing in that Jeanty is pretty well known to have great character and tangibles, we all know the Cowboys at the very least will inquire trade up possibilities to possibly draft him.