Wilson has virtually no impact on their salary cap, they can keep an overpaid backup. If teams want Flynn, it's gonna cost them
You just outlined *why* they'll drop Flynn. The have a quarterback, and he's eating up 7 million in cap room that can cover the cost of a new backup and be used to improve/solidify the remainder of the roster.
Seattle can position itself to make a real splash this offseason, between cap carryover, and the space they can generate by dropping Flynn. At the very least, they can rework contracts for their core players.