I think that Tim no doubt used the save so the show could save face for the team challenge set up being the downfall of the contestant. I agree that neither of them has a chance of winning, but it's evident that with the Jr version they are very very careful to not come across as beating up on the kids. It would not surprise me if the save was producer influenced as part of the "playing nice" tone.
On a different note, I think that Christian was born to be a judge on this show. He is SO good at it. He finds such a great balance between encouraging the contestants, but also talking to them like professionals instead of talking down to them as mere teenagers. He was a great PR contestant whose proven to be a gifted designer, but his role on this show is IMO him at his very best.