In case you haven't heard both Cadillac Williams and Luke Petitgout are out with season-ending knee injuries. Which, to use the vernacular of our times, sucks.
Caddy appears to have suffered a torn patellar tendon, which has much the same recovery time as an ACL tear. Which means Caddy could come back next season but he would not be fully recovered. It would likely take two years for Caddy to get back to 100 percent. Which means the Bucs should highly consider drafting a back in next year's draft (more on that later in the week).
As for the debate over which player is the bigger loss, I fully agree with BucStats on this one. Runningbacks (and linebackers) are a dime a dozen in the NFL. Back and backers are the most common athlete types. Every year we get a story about some late-drafted back (Willie Parker, Terrell Davis) who blows up when given the chance. At the other end of the spectrum are top tier left tackles who are one of the rarest types in the NFL, 300 pounders with cat like quickness and agility (Michael Lewis what what!). Petitgout falls into that category and Donald Penn, who is normally the third string left tackle, is a poor replacement.