First, when Jedd Fisch and George Yarno were introduced back in January/Febuary, they each said that our offensive line will be transitioning to a zone blocking scheme (ZBS). Fisch was a former WR coach under Mike Shanahan in Denver and of course Shanahan is notoriously known for his offensive line's ZBS.
Outside of the Jaguars, there are four other teams who implement the ZBS in their offense. They are the Seattle Seahawks, Green Bay Packers, Houston Texans, and Washington Redskins. Each team was a playoff team last season, but at the same time each team had a franchise quarterback in place. The Jaguars do not. In addition, if you look at the RTs of each of those teams, then it's worth noting that those players are medicore at best.
The Seahawks have Breno Giacomini at RT. According to PFF, Giacomini graded out near the bottom of the leage for his poisition. The Packers have Don Barclay who was an UDFA. If anyone knows anything about the Packers Oline, then you will know that they are below average. The Texans have probably the best RT out of the four teams, but again it's not a ringing endorsement. Ryan Harris, the RT of the Houston Texans, was only signed by Houston in late August. He fit Gary Kubiak's ZBS system because that's the only scheme Harris has been used to. Finally, a name most of you are familiar with, the Washington Redskins have Tyler Polumbus at RT. The Jaguars brought him in for a visit, but Polumbus ended up resigning with the Redskins. According to PFF, Polumbus had a lower grade than Guy Whimper last season. So there's that.
With all that being said, these 4 teams have average at best RTs. The Jaguars do NOT need an elite RT in order to be effective within this sceheme. There are a number of OTs available in the draft who can fit this mold. Eric Fisher and Luke Joeckl are fantastic football players, but there is marginal value in selecting an OT to play RT in a ZBS. Call me crazy, but I think Cameron Bradfield, Jason Spitz, and a rookie can compete for the job.
I don't know what to believe right now. Is it smoke or is it legit? Who knows, but we will find out Thursday. Hopefully Caldwell isn't reckless.