https://youtu.be/CzXwizFVp8Q?t=141
Here you can see just how poor Gafford is in switches on the perimeter. Gafford has great size and length. So that as a rule he should never come out so much and so close to an offensive player. Instead, in this situation he should be around that X mark. And if the Sac player decides to shoot, Gafford can still challenge that shot with his size and length.
And, instead, look at what he does. That what he did is PISS POOR BEGINNER DEFENSE for a big guy. And that will be exposed by good teams in the playoff situations. They will keep bringing him out and keep putting him in those situations.