0 sacks allowed this year from Mongo.
I don't have the post, but he's having the best season of his career with the 49ers per PFF. Probably will be brought back next year.
I'm no LCE, but he may be a little short limbed for that. If I'm not mistaken, Jon's best positions are inside on the LOS.
But the Ravens could sign him as a guard and then kick Kevin Zeitler out to tackle.