At this point he has already moved towards Miller and is just sitting and waiting to see who the ball is thrown to. He's got Wimms and Miller covered unless the pass is perfect.
The read now is the DB on top of Wimms. He started out underneath to give a single high look but basically bails into a cover 2. However, because Arob paused on his route and Wims is on top of him, the DB actually bails on covering his deep half and setting up in between Wims and Arob. Instead he commits to Wims in large part because Trubs is looking at him.
At this point Trubs should have realized this is actually single high that transitioned into cover 2. The underneath DBs on Miller and Arob are really just playing trail technique. However, Miller is covered by the deep safety in his half who is in perfect position to cover.
By contrast ARob is going to come open because the DB is playing trail and is going to let ARob get past him expecting the other DB to be covering deep half. Trubs should read though that that DB has already committed to covering Wims because ARob's delayed route makes the DB think Wims is the only deep threat so he bails on the left sidelines to cover the only deep route he thinks exists on his half. In addition because he started underneath he doesnt get as much depth to cover the left deep half which is why Wimms gets on top of him more quickly.
If Trubs had read this properly he should have come off Wims once the DB committed and then lead ARob down the sideline into the natural soft spot in the Cover 2 just as the CB is about to pass ARob off to what he thinks is the deep DB on his half of the field. Instead Trubs throws it into deep middle where both deep guys can converge.
Really no good reason to try and fit this in to where both deep DBs can get to Wimms and when the LB playing the Urlacher role got enough depth to force Trubs to have to throw this deeper. Ball has to go to ARob.