Derby horses with no wins on dirt
 

Dominican is going into the Derby without a win on dirt (he's actually done no better than 3rd in 4 starts on it). What horses in history have run in the Derby with no dirt wins? I can't imagine there are many.

maybe a Euro horse or two... although I can't think of any.

"There have been maidens in the Derby before. In fact, three horses scored their first wins in the Derby -- Buchanan (1884), Triple Crown champion Sir Barton (1919) and Brokers Tip (1933).
The last four maidens to run in the Derby, however, didn't come close to winning. They were Flamingo (13th, 1958), Fourulla (19th, 1971), Great Redeemer (10th, 1979) and Pendleton Ridge (13th, 1990)."
I don't know if there have been horses that have won races on other surfaces (but not on dirt) to compete in the Derby, but clearly these maidens had not won on dirt (or anywhere else).

I think he ran well in the Bluegrass when the BG was 2 weeks before the Derby or run on a Thursday or something like that

Quite right - he was third in the Bluegrass before he was second in the Derby, but his only wins were on turf. I'm not even sure they had AW racing in GB in those days (mid 1980s), and even now, few top 2yos like Bold Arrangement (listed winner, twice G1-placed) is going to run on the AW as part of their classic preparation.