This sudden weekend outing made Jimmy quite frustrated, as he still had not achieved his main goal. There was no news of Roland at all. According to Father Rodney, the person they had seen was almost certainly Roland, but his coming and going so swiftly, without contacting Jimmy, made it completely impossible for him to continue the investigation.
He took some time to look up information on Jack Chambers, but strangely enough, while he found many people with the same name in the system, none of them matched the person he had met back then. It's either that Jack's identity was problematic, or he had changed his name, using his former name when he met Jimmy initially.
This lead was also cut off, making it impossible to find Roland through Jack.
Jimmy hadn't forgotten the letter Roland gave him with the Black Rainbow. Roland had already said he'd retire and live quietly in the Dark Tower World, so his sudden return had to be for a reason.
