Meh, must be something like the Lingering Sentiment: you have to be aware of every detail concerning attack pattern and technical details that affect attack patterns to be able to defeat them with such low stats.
I wouldn't say that.
Unlike Lingering Sentiment, I feel like Sephiroth is at least predictable in his movement. But maybe that's just me. I hated Lingering Sentiment even on a high level on critical.