Good PG play is important. When your PG doesn't get the offense moving, it's like the team is playing with a 10 second shot clock when the other team has the usual 24.
Cavs tried to replace the "old NBA hand" Larry Drew with a "Player Development" head coach in Beilein for Colin's second year, but it failed spectacularly:
Beyond his meticulous focus on rudimentary basketball fundamentals, which NBA players have little patience for in-season, players roll their eyes at things like the terminology Beilein brought to the Cavs. For instance, all of the team’s screens, cuts, and pivots are named after wild animals. A curl is a “polar bear” in Beilein’s system.
Yikes.
Players that stick around in the NBA usually keep growing their Point skills for their first 5-6 years. There's a legit argument that 4 coaches in three years, bad teams, and the ACL injury have Collin 1-2 years behind where he could have been. I mean he doesn't look like a PG to me, and 1-2 years might not have moved him forward that much, but I'll admit that Collin had some obstacles to becoming a legit PG in his first 4 seasons. He didn't over come them, but it still seems like Collin deserves another chance to show where he's at these days. But it should be off the bench against second units and should come with a short leash.
More importantly he needs to improve on the defensive end. That's likely going to be a big challenge as well.