But that's just fine with Castillo, who figures the unit is improving each day. He says the offensive line must fight through the fatigue and pain.
The group is made up entirely of underclassmen, including a trio of freshmen -- John Frady, David Overmyer and Mario Henderson -- that will be asked to contribute this season. FSU opens at North Carolina in less than two weeks.
"Like I said, everybody was telling us we had a good spring but none of these defensive tackles were out here," Castillo said. "They've come back healthy, they are fired up, they are ready to go. They are 10 times quicker than they've ever been. They are hungry.
"(Darnell) Dockett has really taken a leadership role out there. He's fired up and ready to go and he wants to have a great season, so does the defense. We've had a lot of games last year where they had a letdown and so did the offense. We just have to come out here everyday and get better. They are coming out here and play with plenty of enthusiasm. It doesn't matter how tired they are."
"A lot of these guys are just getting introduced to college football," Castillo said.
"It takes everybody awhile to get used to the speed of the game. It's a drastic change from high school to now. We are telling everybody to keep their head up. Everybody is tired, everybody is sore. They need to get in there and get their reps and pay their dues."
Frady, from Jacksonville Bolles, is making the difficult transition from high school guard to collegiate center. It's the same move Castillo had to make when he arrived at FSU from West Palm Beach. Frady also is battle scarred, suffering a knee sprain and concussion during two-a-days.
"Frady is looking well. He's trying to make the transition to center, just like I had to do. I played guard and tackle in high school," Castillo said.
"When I came here I made the move to center and it took me a long time. It took me longer with all the injuries. He's picking it up. He's still having problems snapping and stepping and stuff like that. That's the hardest thing about learning center. Making all the calls. You are the captain of the offensive line and you have a lot of responsibility. It's going to take a little bit of time but we are going to need him step up and learn as much as possible as fast as possible."