Hey Andrea...i see you posted this over at consimworld. Did you ever get clarification?
1) For now i'm going by the book...
h. Line of Communication. An LOC is a path of hexes of any
length, free of enemy units or uncontested enemy ZOCs, from one
friendly hex to another designated friendly hex. An LOC cannot be
traced into or through any non-French hex.
I like the idea of using the stricter LOS rules for LOC because it creates this brief window right after the Sedan breakthrough for the Germans to ponder pushing south with a few divisions to try and cut LOC to the Maginot Line. The Germans sure could use the VPs.
With the rulebook LOC rules, forget that, on to Abbeville...
Actually, i just noticed the crossing interdiction example of the rulebook (page 6) very clearly shows LOC and LOS being treated the same in regards to river crossings... so now i think the TEC chart is right.