Over the past two days I've playtested the entirety of episode 4 offline free-roam. I was curious to see if there was any glaring reason why they would have disallowed entry, like something being buggy or unfinished or something? Nope. Only thing I found was that they forgot to put some boxes into the Crater Northern Route map. They clearly left two boxes as placeholders where they meant to place more later but never did. No biggie.
It figured that after making my way through all of Sub Desert 1-3 to get to Saint Million on VH difficulty, that my poor level 60 Huney spawned Kondrieu, haha. Normally that's a good thing but everything except his darvants and missles one-shot me. I spent too much time working my way down there to give up, so I loaded up on Scapes and I eventually killed him. No drop, but one of the boxes had a 0/0/30/40/45 Arrest Vulcan, so that's something.
Anyway, thanks again for the updates to single player. The difficulty and risk/reward is just fine now, in my opinion, and a real boon for those of us who choose to not transfer S-Ranks and other uber items around and instead use the best of what we can find for each character.