Well, if no problems are caused and a few are solved, then we're doing well.
There are of course still a questions or two it does raise, like "How the hell did they find her", but those are (probably) to be addressed in my next post.
Your plans for Andreas are perhaps not dead yet, as I can imagine that the Inquisitors will return to try and find Andreas after the carnage has settled. He's a useful asset and has what they believe to be a number of potentially useful leads with him. Your choice.
Imperial Armour 4 tells me an Arvus has a 22,000 km range (a little excessive, as this would be enough to circumnavigate Terra with room to spare), so they're unlikely to rule it out for lack of fuel, in any case.
(Funnily enough though, IA 4 doesn't list the Arvus as having VTOL capability, but other sources do - I went with it, because it made more sense, it was more convenient - and just cool.)
On the note of my choice of craft, Riley is of course the kind of person who would have an Aquila or similar, but there's two reasons I didn't include one - a) it's far too big and ostentatious for a quick and inconspicuous extraction in potentially unknown terrain, and b) I imagine she would have taken hers to the Asculum, so I don't imagine it's particularly flyable any more.
And Ekkehardt* is referring to Barkley. I've rephrased it slightly to clear up the confusion.
*He knows Haines from the journey in to Sigma, but wouldn't have been the first person Riley kept appraised of who her meeting aboard the Asculum was with. He's not exactly possessed of the social graces required to attend, and Riley didn't want him to have motivation to insist upon it. (He would have lost that argument, but she didn't want to have it at all). He's probably not going to be entirely impressed to be told.