To me you've got the surefire hall of famers: Ray, JO, Ed and probably Sizzle and then probably Yanda joins that group when he's done - id have Ngata and Heap just below them
Ray, JO, Ed, Sizzle and Yanda were dominant at their positions for crazy amounts of time - Ngata and Heap were also players who would be regarded at times as the best in the league but not quite in the same way nor for as long but they still had those peaks which would separate them from some of the other ravens you might include with them (legacy-wise i dont think they'll be regarded in the same light as chris mcallister and bart scott etc.) - the one curveball is how joe flacco goes legacy-wise - he was never someone who was the best in the nfl at their position outside of 4 magical games all in a row and as good as he sometimes was he never really reached those heights again for various reasons and yet the importance of those 4 games and the importance of him as the first franchise qb in the organisation's history is also important
the legacy of flacco and his place in ravens lore is ironically probably dependent on what comes after him - if lamar (or whoever comes after lamar) absolutely ball out and lead the ravens to perennial playoffs and an eventual superbowl (or better) flacco's legacy will probably fade a little but if the ravens have a concerted period of struggle to replace him over time then his legend will only grow until he reaches the kind of profound placement at the top of franchise history with the HOFers despite never even making a pro bowl