After trading away Jonathan Greenard during the NFL draft a couple weeks ago, the Vikings find themselves light on depth at the outside linebacker position. That's an important area they may want to address with a veteran free agent. The Vikings have a strong starting duo in Andrew Van Ginkel and Dallas Turner but not much behind them, even if you consider versatile second-round rookie Jake Golday an OLB in the Van Ginkel mold. Every other edge defender on the roster is a current or former undrafted free agent, with guys like Bo Richter and Tyler Batty next in line for snaps. The good news is that there are still a handful of players on the market who could help. The Vikings freed up a decent chunk of cap space when they traded Greenard, and they may want to use that money on a rotational edge player in addition to signing a No. 3 wide receiver .…