The Ravens have reportedly "upped their offer" to Mosley, although it's said to be still short of the Jets' offer, whatever all that means. What it does sound like is a bit of desperation on the part of the Ravens. According to Jeff Zrebiec, they were also surprised by Suggs' decision to leave.
You wonder if maybe the Ravens weren't caught off guard a bit by the early free agent feeding frenzy. Teams swimming in cap space are jumping in feet first, and the Ravens are not one of the teams in a position to try and keep up.
Suggs might have just wanted a season at his home. Likely his last.
Mosley seems to not want to leave. If the Ravens can come close he will take less to stay. I don't want them to overspend. He can be replaced by cheaper options until a draft pick is ready.