Under LVG, it's not about doubling down on defense duties. If anything, we're better at making the pitch big, however, the risk at getting counter being outnumbered by opposition was greater. Smalling pure defensive skill is beastly while Blind ability to read the situation was better than Lindelof. Blind showed he was braver too. Took more gamble even though getting punished for his flaw. Smalling and Blind are very flawed which despite their individual brilliance, it would never be fully covered. LVG is anything but playing low block, and parking the bus.
We scored more in PL in Mourinho second season. Not something great really, but let's not forget we for the good thing under Ole got more penalty than under Mourinho. Point wise, even when we finished 6th in Mourinho first season, we got 3 more point than under Ole full season. The 6th position was level above 7th while now that gap is narrower, while the gap between title intender and team fighting for top 4 and EL places is bigger.
So overall, looking at the context of the whole league, not some isolated stats, we're not moving anywhere. It's the dynamism of league the moves. Getting carried away staying still when it shifts, we would be in trouble as Arsenal finished 2nd by some chance in that infamous finished 3rd in 2 horse race season. Arsenal didn't improve from previous season that season, but benefit from similar situation, just ended up where they're now few seasons fast forward.