You pose a good question, Anne, and I think that he'd be back in a heartbeat and would be holding her hand until she was better. The two obviously care for each other, as we've seen many times on the show. For example, who was the only one there when Gil was getting ready to go into surgery? Also, Catherine was there when Gil was attacked ("That looks like a hickey..."). So yeah, I think it's only natural/appropriate that he would be there holding vigil. And in my mind, I think that Sara wouldn't appreciate this, and that it would cause a strain on the marriage. However, in the writer's GSR-riddled minds, it wouldn't be a problem. Of course.