.. and they all seemed pretty stoked to reunite!
Barkley and Mayfield hugged it out ... and Saquon actually carpooled with Darnold (Jets and Giants mingling?!).
Of course, Saquon couldn't have been nicer -- complimenting his new NY rival ... even saying he's rooting for him!
We also asked Barkley about Eric Dickerson's recent comments -- that he's hoping Barkley will NOT break his rookie rushing record, and Saquon even handled that with 100% class.
"I don't care for that," Barkley said about breaking the record ... "I wanna win championships."