Since well more than half of the NFL was not 4 or 5 star, you could theoretically build a championship college team with zero blue chip players. The limitation is purely evaluation and development. Any rational person wants all the blue chippers we can get, but if our coaches accept the commitment of a 3* early in the cycle, they likely did so because they really wanted the player and feel like he is better than his ranking. Sometimes a teachable high character 3* with a high ceiling is more effective than a 5* jerk who won't do the work.
So yes, when they fit, bring me all the 5 stars, but if the coaches like a lower rated guy, I look forward to seeing what they see.