Pros and cons of incorporating a level 70 in a level 60 group ?

[Caspian]

(that is at level 60, I won't go sooner)

That used to be the smart thing to do because you usualy got just enough xp to get you to 62 before going to Zangarmarsh - sometimes you had to grind a small bit to get there. But since bliz dropped the xp required for each level 60-70 you will have no problem getting to 62 even if you go at 58.

FYI

But, with RAF you go from 58-60 doing the cauldron quests in WPL, in an hour. You are usually also under geared, while not that big of a deal for a boxer it will slow things down. Get to 60 then hit the outlands use all that big XP for the longer road to 70. You will be a little stronger and have better surviveability. If you do not have RAF, I would agree get to outlands as soon as you ding 58.

As to the orginal post, wait till the mobs are green to the 70, then rotate him in like suggested above.