I think they'll go for a bigger fish from a PR perspective, but they should absolutely consider hiring Groce. I think he'd do a great job at that level. He'd also be able to recruit second-tier Chicago kids as effectively as Archie has, IMO. Groce has a good rep in AAU circles from his time in Champaign - seen as a stand-up guy and hard worker.
Plus he's the same coaching tree and philosophy. Would represent continuity with their existing success and probably keep some staff. Yet a bigger name than elevating an assistant.