Good legendaries trump pieces with good stats everytime. So if you wear Elize because its good, passing on some pants is not something you should feel bad about.
Same reason many of us passed on the T19 tier chest piece at the beginning, because Eko is better defensively, even if the tier had vers/mastery on it.
On that note, the Tomb BiS list in the Google Doc seems slightly confused (or maybe old?). It claims gloves are the worst tier piece with crit/haste, however, actually the gloves have vers/mastery and are therefor like the best?