How did the much less advanced Franklin make it through the asteroid field/nebula when the much more advanced Enterprise was needed to make it through on the way to Altamid? Possible explanations: -The Enterprise crew uploaded the navigational data from the destroyed Enterprise into the Franklin's computers so they could easily find their way back. -They followed the route Krall took. -It is easier to make it "out" of the nebula than it is to make it "In". The last two explanations are probably the weakest in terms of convenience. One other potential plothole: How was the comparably slow Franklin able to make it back to Yorktown in time to intercede Kralls attack? Horse and buggy indeed.