Looking at Rodon, I see a lot of comparison to David Price in terms of career path.
Price was drafted in 2007, but didn't play. In 2008, his Age 22 season, he made 19 starts at various levels, and went 110 innings. Then he made his Rays debut in mid-Septmber, and basically was a reliever for the postseason run, and got 20 more innings. Total- 130 innings
Then he went back to AAA to start the 2009 season, Age 23. He made 8 starts/34 innings, and an unspectacular 3.93 ERA, but was called up in mid-May. He then made 23 starts for the Rays, over 128 innings, and had his struggles--4.42 ERA. Total- 162 innings
Then he went on to have several great seasons starting at Age 24, with mostly 200+ innings. He had one year where he missed about 6 starts. The Rays went 105-65 in his starts.
If the Sox are getting Rodon for 6-7 years, let's play this right. He's 22, and has 24 minor league innings under his belt. He needs innings, and there should be no rush to move him up.
My hope is that they really don't need him before September, but can use him for their own postseason run.
You never know what the need will be during the season, but at the very least get about 40-50 innings in the minors before thinking about calling him up.