Donovan Peoples-Jones was a major disappointment this summer. It would have been beyond surprising if he survived the cutdown to 53. I think his playing days with the Lions are over.
Kaden Davis probably became the Lions # 5 or # 6 WR in the team's WR pecking order. I thought he played like the # 5 WR, though he didn't jump out enough to be a better option than multiple players at other positions.
If Davis clears waivers, which probably will be the case (at least a 70% chance), he warrants serious consideration to be signed to the Lions PS.