A large number of Elisande logs are just one phase or perhaps 2 phases. Naturally these logs are heavily featured in higher ranks for both DPS & speed.
https://www.warcraftlogs.com/rankings/11#boss=1872&metric=speed
Only logging one phase:
https://www.warcraftlogs.com/reports/y1ck3fTQtb2ArqvJ#fight=52&type=resources&hostility=1&source=281