One should note that Arsenal have great difficulty playing at Highbury for ECL. They struggle. And badly. (As opposed to Celtic who've kept their unbeaten home record for, is it, sixty something games.)
Of course, if you think about it, it's possible that Arsenal do what they do best at home - Draw. In which case, if either Inter or Dynamo win, then Arsenal are out, which is very possible (I can't see the game drawn). If Arsenal draw they'll be on 8, whereas the winner of Inter/Dynamo would be on 9 or 10, and Locomotive would be on 9.