Crawford is extremely valuable in the most scarce offensive category (steals), very valuable in 2 other categories (runs and BA), and won't hurt you in the other 2 power categories. Plus, until last year when he was fighting some injuries, he had improved in HRs every year of his career - assuming he's healthy, he should get to 20+ HRs. He mostly hits in the 3rd spot in the lineup, which is a prime RBI spot in a good TB lineup. And he's only 26... so there's no reason to think he's peaked.
Crawford's value is tied up in two key stats: HRs and Steals. If he hits 20 HRs and steals 50 bags, he's well worth a 1st rounder. If he fails to meet either of those numbers, he's worth a mid-late second rounder. I personally think he will hit both of those numbers, so I'll hopefully be taking him at #12 or #13 in my draft.
"The government cannot give to anyone anything that it does not first take from someone else"