Chychrun's puck moving skills are much much much better than Barrie's it's not even close. Chychrun has one of the best breakout passes/puck rushing skillsets in the NHL for both zone exits and entries, both for volume and for success rate, and is a one man transition for an absolute dog shit team. Barrie was one of the worst Oilers in transition, had horrendous breakouts and zone exits both for volume passing and passing success rate. And we don't even need to talk about zone entries b/c he's hemmed in his zone so often that by the time it comes out the only option is for the forward to dump and change. There's a reason why this guy was dead last among full time Oilers defensemen in even strength points during the past 2 seasons. He's a good smart in zone passer. Nothing more. This works for the power play b/c McDavid is a zone entry machine and nobody ever gets hemmed in on the power play, but at even strength the guy's puck moving skills were a liability.
Ekholm fits the Oilers needs and is an excellent breakout passer in his own right. In fact Ekholm's puck moving skills are almost as good as Chychrun's. There's a reason why the guy is top 30 for even strength points among dmen the past half decade and blows Barrie's even strength production to kingdom come. Ignoring the Ekholm vs Chychrun thing though, suggesting Barrie is capable of holding Chychrun's jock in transition is beyond absurd.