If we actually look at the graph, this current movement performs better than previous dump into pump
Major reason should be due to BIP91
it solves the problem of compatibility within segwit2x and BIP148(UASF) , the worst fear that everyone is worrying is the chain split. But seems that this current proposal wipe out the fear of most whales
It's not a certain thing that BIP91 will solve the issues of SW2 and BIP148, to my understanding. It's not even a certain thing that everyone needed will be on board, but you're right, this probably explains the current price hike.
As there is still no certain direction more volatility must be around the corner.