You argue that the Rams dont know what they have in Mannion and they wont have the reps to figure that out so they should trade him. If the Rams don't know what they have what makes you think another team will offer value for that guy. At least with Foles there is plenty of game tape to break down. Mannion has little to no value to an outside team right now and you certainly wont recoup the third round pick you spent on him just last year.
Foles and Keenum are most likely gone next year getting rid of Mannion now leaves the cupboard bare for 2017. Whereas if you keep Mannion you at least have a backup with 3 years of experience on your team instead of trying to pigeon hole a vet into the system or waste more valuable draft capital looking for another backup who would be 3 years behind Mannion development wise. Getting rid of Mannion right now highly unlikely IMO wouldn't make sense for the Rams and I don't see anyone giving us anything close to the third round pick that we just spent on him so we might as well keep him in the building and keep developing him.
I said why.
Pay Keenum and keep him. A backup who can win is worth the money.
Mannion after this season will have 2 years under his belt and what? Still virtually no reps and still very little pre season time with the 3rd string and still very little development and THAT will be the basis for him to be THE GUY if Goff goes down?
As opposed to Keenum who will have started a bunch of games and have that starting experience?
2 Years on the bench with a few practice reps and a few minutes in a couple of pre-season games isn't enough development by itself to be a #2. That's barely enough to be a #3. It's close to abandonment.
Btw, this happens all the time all over the league. Sometimes a guy won't even unpack his suitcase before it happens. A guy is signed and then released, so there's no chance he showed anyone anything. Teams sign and release guys ALL THE TIME without enough information to know all they should know.
Mannion right now is basically a red-shirt Pro. He got to redshirt last year, did all the NFL stuff, classroom, weight room, be in the practice environment, participate...some... So, he's NOT a rookie. He's actually played in a few preseason games and took a few snaps in an NFL game. But...he's not going to earn a starting or backup job, either.
He's in that tweener stage right now between Rookie and Veteran. Well, in a constricted QB market, teams have resources to develop QBs, but there aren't QBs to develop.
We will have a #1 overall QB to develop, a backup QB that we shouldn't let go in Keenum and a 2nd year QB who's gotten little development and will get little or less this coming year due to drafting the #1 overall. Makes more sense to put ALL the available development resources into Goff.