For content designed as group content the dev's should add some tools to effectively group up. Esp. considering that for stuff like killing/chaining mobs the level difference is so important. It's quite annoying that I (as a max level player) can't really help my low level friends execpt as a taxi or when killing FATEs. In all of my time in Eureka I've only ever seen once a mid-level (10) party doing challenge logs (probably done by people manually searching the player info).
Please provide a tool to make grouping easier or provide a level-sync option.

Also consider Logos not to disappear when leaving Eureka, this made me very hesistant to use them all, esp. as farming them isn't as easy as it was before ...