1. Natural replacement at the slot: Arthur Maulet
One possible solution, and perhaps the most obvious, would be to simply use Marcus Williams and Geno Stone at the two safety positions while dropping veteran nickel corner Arthur Maulet into the slot cornerback role.
Maulet signed with the Ravens before the start of the season but different injuries left him off the field at different points through the first three months of play. When called upon, however, he's been more than solid at the role he was signed to take on.
The veteran struggled a bit in last weekend's game against the Rams, particularly given the tough assignments against skilled wide receivers, but he's been good more often than not for the Ravens this season.
So far, Maulet has 16 tackles with one interception and he's allowed 20 receptions on 30 coverage-targets through Week 14. PFF has him graded at 64.2 overall, but he's curerntly boasting a gaudy 84.2 grade in pass-rushing actions.