Well once again I must disagree. Once again I must admit my lack of pedigree in this area, but I see the two players 100% opposite as you. Shazier is a VERY instinctive player who plays down hill with an attitude. Funny how you say he doesn't play instinctive and CJ does, yet Ryan has 23 tackles behind the LOS to 9 for the great CJ Mosley. Plays behind the LOS scream of reading the plays and being able to trust your instincts to get to the ball and make the play. Playing safe like CJ does too often will not translate into the NFL. The NFL is about play making ability and Shazier has it in spades, while CJ is about not over running the play and is average to below average at reacting to the play once he does read it.
In pass coverage, I will admit CJ has a real knack for playing zone and reading the direction of the QBs eyes, but that will get him trouble in the NFL, QBs will look him off with ease. Ryan on the other hand is better in man to man coverage and makes up for any lack of recognition with aggression and speed.
As for the size issue, Ryan Shazier will be able to easily add 10-15 more pounds on that large frame without suffering any to his speed. He plays with the rabid dog attitude that has been missing around here. CJ's "play it safe" style is not what this team needs. We need playmakers and Shazier is the definition of playmaker. Shazier's 9 ff to CJ's career of 2 shows the attitude and aggression he plays with. CJ will be a safe pick that will have a slightly better rookie year, but Shazier will have the better career, with 3x the game changing plays.
Ireland was the king of taking the safe pick, and where did that get us? Shazier isn't the safe pick, he is the drafting for potential and playmaking ability. I will take Shazier every time.