He’s not a great shooter
In the NBA, being a great player after coincides with being a great shooter. McCaw, unless he can develop a more consistent, jumper won’t be a great shooter. He shot just 33.3% from deep his rookie season and then followed that up with a poor 23.8% his sophomore season.
On a team already laced with non-shooters like Kevon Looney, Shaun Livingston, and Jordan Bell, it’s not a good idea to bring back a second unit guard that can’t keep the floor spaced. That’s why McKinnie has been a much more impactful addition for the Dubs.
At large, McCaw wasn’t an efficient player. He shot under 44% in both seasons, and like his three-point shooting, he relapsed his second season as well. Why would the Dubs bring back a player that has limited upside like McCaw?
It’s unlikely they view he’ll be a star one day, or they’d pay him like a rising star. Obviously, Golden State didn’t want to increase their budget for McCaw which is telling for how they view his long-term future with the team.
His offensive efficiency is a problem, and that alone is a reason to be concerned about signing McCaw to a deal longer than one year.