Nico Siragusa is starter material...Dude is a beast, who played every game that he was eligible in college. Look at his stats(or game film), he is not only a piledriver, but extremely durable to boot. I could easily see him starting at LG, and moving Alex Lewis to RT.(remember, Lewis played tackle in college, so not such a big transition for him.) As far as center, I wonder that Mangold and the Raven's don't have a handshake deal that he signs after June 1st. We'll have to wait and see...
Hope you are right but I do not have much confidence in him to start. Here is the NFL weakness report on him, pay particular attention to the comment pertainng to his reach ability on Middle LBR's... "Labors coming out of stance. Tends to pop upright and is delayed in his lateral movements. Reach blocks and cut-off blocks on middle linebackers are mission impossible. Hands are a little slow with inconsistent placement. Impatient with punch and will get caught lunging. Has to work to keep weight balanced in pass sets. Unable to punch and mirror, allowing active rushers a pathway to his edge."