I completely disagree just looking at the draft:
For DT's there are 14 with a grade of 1-4 and at edge there are 20 with a grade of 1-4.
For OT there are 9 with a grade of 1-4, at G there are 9 and at C there are 3.
There are going to be draft grade DL's of 2-4 available in the 3rd, 4th and 5th rounds while the majority of the OL's are going to be gone by the 3rd round. You will have to be picking 5-UDF in the later rounds of the draft.
This is probably not a popular opinion but if Dewayne McBride is available in the 4th or 5th round I think the Packers go with him. He is a perfect RB fit for zone blocking.