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The answer of course is he is a sophomore, and will be available no earlier than 2011 draft.
Caleb is 14 out of 17 at the time of this writing, and just hammered home a 56 yard field goal for the Florida Gators. Its not all uncommon for a kicker to go high in the draft... just ask the school a little bit north of where Sturgis attends. Sebatian Janikoski was the Oakland Raiders 1st round pick in the 2000 NFL draft, and is still with the team, and probably will be for life. He was taken at #17, and though unlikely Sturgis would go that high, he does still have another year to go to beef up his already impressive resume.
Tampa Bay picked up a placekicker as early as the 3rd round; with the 80th pick in the 1999 draft, the Bucs selected Martin Gramatica who kicked them all the way to the Superbowl before erratic kicking ended the kickers career with Tampa Bay in 2004.
Tampa Bay likely will give current kicker Shane Andrus a chance this year; while he has virtually no official stats, he was impressive kicking in the preseason for the Indianapolis Colts when their famous kicker Adam Vinatieri required time off for injury.
Although there is a very good chance placekicker may not be on their list then, Tampa Bay could do worse than not consider the highly talented Strugis from Gainesville.