I though Hoid killed Gaz.
The last time we see the bridgemen talking about him is when they find the Emerald broam, Kaladin said they have to give it to Gaz but keep the rest of the spheres they find. The very next bridge run Gaz is gone, that’s the one where Dalinar saves Sadeas. After the battle and back at Sadeas camp Teft shows Kaladin he can inhale Stomlight, Kaladin thinking he’s cursed goes out near the Plains and sees Hoid’s fire. There Hoid makes the comment about being attached to his Stormlight, and holds up an Emerald broam.
The only why I can think of is that Hoid can see a little into the future, and if Gaz was still alive would have stopped Kaladin from going out onto the peninsula where he was waiting.