Answers start coming this week. Not definitive answers, mind you. That will take months. But when the Dolphins’ rookies convene over the next three days for a minicamp that is closed to the public, the coaches and front office will start gleaning insight into which of the healthy rookies will be ready to assume meaningful roles next season, and which of the low-round draft picks and undrafted rookies will prove worthy of a roster spot. Healthy is the key word, because first-rounder Dion Jordan and third-rounder Dallas Thomas are recovering from shoulder surgery. A look at how the rookies factor in at key positions: • Cornerback: Second-round pick Jamar Taylor and third-rounder Will Davis assuredly will make the team. The question is whether either or both can beat out Richard Marshall, Dimitri Patterson or Nolan Carroll for one of the top four jobs, alongside former Pro Bowler Brent Grimes. “What’s there is a lot of competition,” general manager Jeff Ireland said. “You’ve got some real good veterans that have played very good football in their career. Then, you have some young guys we’ve drafted. I feel good about the position. We’ve got a lot of talent over there.” Speedy seventh-round pick Don Jones, a safety at Arkansas State, also will compete for a roster spot at cornerback. • Tight end: Fourth-round pick Dion Sims almost assuredly will be on the team, but the question is whether he shows enough over the next four months to seize the No. 2 job behind Dustin Keller. Incumbents Charles Clay, Michael Egnew and Kyle Miller also will be in the mix. Ireland is encouraged because Sims dropped his weight from 280 to 260 since his season ended at Michigan State.