I honestly can't be arsed to check. The 100% Eidolons give about 25% more damage with their extra ~60% Elemental.
But 140% isn't until December. And reminder that in order for them to be more than 100%, you need to be running a full same-element Eidolon set-up, which hurts base damage a bit.They most likely will eventually. Light and Dark are a bit special how they don't have any weaknesses, and that's why their 100% Eidolons are weaker (require full same-element Eidolon set-up) than other elements.Probably yes, if you didn't reroll to begin with. Unless your Light SSRs are something crazy like Take and Tish and Sol and Michael.... but why? Just use non-friends. Reroll the friendlist with the 8 AP dailies.