If you look at the Texans and who they had on their line a lot of their players were drafted in the later rounds. Eric Winston and Chris Myers, two former Miami Hurricanes, were drafted in the 3rd and 6th round respectively. Duane Brown (LT) was a 1st round pick, 26th overall, Wade Smith was a 3rd round pick by us and Wannstedt tried him as a tackle and he sucked but he's playing LG for them and doing well and Antoine Caldwell is the RG and was a 3rd round pick.
In Green Bay they have Marshall Newhouse at LT (5th round pick), Evan Dietrich-Smith at LG (undrafted), Scott Wells at Center (7th round pick, although he is now with St. Louis and been replaced with Jeff Saturday), Josh Sitton at RG (4th round pick) and Bryan Bulaga at RT (1st round pick, 23rd overall).
It seems to me you can find athletic O-lineman later in the draft, something Ireland and Sparano couldn't figure out.