I guess whether Howard and Romero remain eligible will depend on how MLB treats September service time on the roster. They both won't hit the innings limit this year but if you pro-rated their roster time they probably should not be rookie eligible next year.
MLB loves to rank recent draftees. Really no idea if Ragsdale is top 30 material with no performance history. There are probably a dozen players in the low minors that could easily be better but just did not get a chance to play this year.