RE:concerned1) I don't know if those others have hedges or not. Price of oil is down and CJ no hedges so it will be impacted more than some others by a declining oil price.
2) Possible that some of those others are buying back more shares than CJ. That would support the share price of the others.
3) Some of the others didn't run up as much as CJ over the short term or the long term so there could be fewer taking gains.
Just a few possible reasons for a difference in one day of price action. As a long term holder, I don't bother looking at what a company does in one day vs another company on the same day. Rather I look at the current price of both (or all options) and determine where to invest my next dollar.
GLTA