We killed Elegon last night.
1. Make sure all the pillars go down within a pretty short timeframe.
2. Both tanks run to the "ranged hug position" (for us it was on the edge of the big circle so they could easily reset stacks).
1 of the tanks pick up the adds while the other tank runs to tank Elegon. I tanked the adds on my brewmaster monk.
Taunt on my ox statue = All adds on me, Leg sweap = 5 sec aoe stun --> NUKE THEM DOWN
It was no problem really. Just make sure the tank pop a cooldown when tanking the adds. You cant burn all your big CD´s here, since you will need them in the last phase to ease it up for your healers.
We killed all the small adds before the first big add spawned in that phase. I ran to tank the boss after the small adds were dead (because i had no stacks then), and the other tank could run out, reset his stacks, and tank the 1 add that just spawned.
Hope this can help.