The issue with criticizing the lack of moves along the offensive line is that there was no reason to address the offensive line so heavily.
We know Jensen is a pretty decent starter. The front office predicted that and made the correct call in determining not seeking more help for a center. Between Urschel and Jensen, one would win and be a pretty decent starter. Then, the other is a really quality top backup along the three interior backup spots.
At tackle, the Ravens did make a move for Austin Howard and I think it was the right move. Sure, he's not playing great and he's a little uneven, but he's been alright. Thought the first two weeks were okay and the past two are the ones that are slipping. Anyway, by signing Howard, you have Stanley (who closed out the end of the season on a tear) and Howard as the starters and Hurst as your swingman and we know that Hurst looked okay in the preseason.
Realistically, the Ravens were pretty set with a line of Stanley-Lewis-Jensen-Yanda-Howard. Is it great? Not at all. Is it serviceable? Absolutely. Then, as backups, you have Hurst, Urschel, and Siragusa as your primary backups and it actually looks okay.
At what point do you ever expect to lose Urschel, Siragusa, Yanda, and Lewis? You just lost two starters and two of your primary backups. Tell me at what point an offensive line predicts the loss of four players and plans accordingly for it.