ESPN's Insider group evaluated what every NFL team has done so far in free agency, and the Baltimore Ravens received a grade of "C." That's extremely fair given that the Ravens have signed only one free agent from another team (safety Kendrick Lewis) and watched four starters (defensive tackle Haloti Ngata, wide receiver Torrey Smith, tight end Owen Daniels and safety Darian Stewart) go elsewhere.

It's always difficult to judge the Ravens at this point in the season. Their history is not making big signings in the first wave of free agency. Much of their team building comes through the NFL draft and modest free-agent pickups after March. The Ravens didn't sign Daniels and running back Justin Forsett until April.

At this point, the more accurate grade for the Ravens is incomplete. What the Ravens do over the next couple of months in free agency and in the draft will determine if they return to the playoffs for the seventh time in eight seasons. If the Ravens lined up right now, Kamar Aiken would be the No. 2 wide receiver, Crockett Gillmore would be the starting tight end and Asa Jackson would be the No. 3 cornerback. These positions need to be addressed.

Some will point out the Ravens didn't sign or draft a right tackle after Michael Oher left in free agency last year, and they filled his starting spot with someone already on the team. That is true. Rick Wagner solidified the right tackle spot with no previous starting experience and even proved to be an upgrade over Oher.

But the Ravens also ignored the cornerback position last year, and that ultimately became their downfall in the playoffs. They banked on Jackson and Chykie Brown to replace Corey Graham as at the team's No. 3 cornerback, and neither were able to do so. Jackson underperformed even when healthy, and Brown struggled so much that the Ravens eventually cut him.

So, how they filled right tackle shows the Ravens can promote from within but how they miscalculated at cornerback shows the importance of needing a dependable fallback plan.

This is why there is concern about the current holes at wide receiver, tight end and cornerback, and the Ravens don't have much cap room ($8.3 million) to splurge at those positions. The limited cap dollars forced the Ravens to become budget shoppers this offseason. The Ravens were interested in a handful of free-agent cornerbacks, but they couldn't come close to the $7 million average per year deals.

The few moves the Ravens have done are all positive ones. Forsett, the NFL's No. 5 leading rusher from a year ago, was re-signed to one of the best value deals in free agency. Lewis was an under-the-radar pickup that fills a need a safety. This is certainly a solid start, but the Ravens know they need to do more. Coach John Harbaugh indicated at the NFL owners meetings that the Ravens want to be proactive in free agency.

It wouldn't be surprising to see the Ravens make a run at a wide receiver such as Michael Crabtree or Greg Jennings. No one would be shocked if the Ravens signed a veteran tight end such as Zach Miller or traded for one. There are still moves to be made. Plus, the Ravens have 10 picks in the draft, where this franchise has always done its best work.

The Ravens rarely get an "A" in free agency, and they probably would've be given a grade lower than a "C" this year if not for their track record of winning. And, given that history, it's better to wait until after the draft to accurately evaluate where the Ravens stand.