Let's make this a zeta and make clones a touch more viable: zeta: -10% penalty. When assisting has an x% chance to reduce his cooldown by 1 and echos attacks ( including and especially emp ) can not be countered.
This addresses two points. Echos vulnerability without a taunter, and some mechanism to remove enemy buffs in a dual taunt scenario. It would be nice if he could use his emp every turn but an x% chance to reduce the cooldown should make things shiny.
In a team with kenobi and baze with a zetad barris, clones are unable to beat this team at all. It's actually a bit of a stalemate though in GW after an hour or two or three or four clones will eventually lose. They just get locked in by taunts and there is no burst damage that can chew through Barris's heals ( Cody assault is severely reduced and then the clone followups because of a lack of alternative targets just end up healing cody's attack's damage ).
It would be better if the emp would do buff immunity as well but at least this zeta would be a start.