Thanks, all of you! You guys all zeroed in the key thing: what to do with BB-8. The larger issue is that, in these films, Luke has purposely hidden away on Ahch-To; I don’t want “my” Luke behaving that way, if I can avoid it. But secondly, even if we grant that premise insofar as Luke’s character development goes - who made the map and why??? Even in TFA’s own context that doesn’t make sense.

Hmm, what if either (a) BB-8 simply escapes, with the goal of hooking back up with the Resistance and reporting on the failed mission; or (b) Poe sends BB-8 to find the local Jakku Force-user?