It is like running a mile and one person gets a 1/2 mile head start.
Even with Pace missing almost all of his rookie camp, he pushed his way in the starting lineup because he was so far along and was an alternative pro bowler in year 2. It was clear he was prepared for the NFL. Robinson was at like a high school level, both knowledge of the game because of his limited college playbook and fundamental level because he just bullied everybody in college.
There is no way, there wasn't an opportunity to flush that out with Video and interviews by the NFL Football people that he was a project and you cant' afford projects in the NFL to develop players for their 2nd contract. You need immediate production because the NFL stands for Not For Long.