Pretty impossible to make even an educated guess about the market for a depth forward, imo. With only two slots on the roster, G depth is much easier to judge team to team.
Perhaps they looked at Torrey Mitchell getting $1.9 and Doug thought Burish at $1.8 was a good deal. There are plenty of grinders to make comparisons to. To be fair, let's look at what's going on today for grinders:
Torrey Mitchell $1.9 cap hit for 3 years
Glass $1.1 for 2 years
John Mitchell $1.1 for 2 years
Moss $2.1 for 2 years
The $1.8 is whatever. The 4 years is what I don't like.