If you are all shammys then make a /follow on his main aswell and have that on in the start so you basicly look like one of his shammys. Some teams will fall for this for sure. and dont notice you as a solo guys healing. Maybe even do Earth shild on one of his alt in the start.. so he gets the focuse..

I have a mate that is curantly lvling up a shammy with the same name as my shammys for 5v5 in expansion. We will use the /follow tacktick and then ofc he have the same name so it will be even harder to pick him out form the grp.

But its true.. with full CC/stuns on you, non can expect you do be able to heal a whole 5v5 team. So your mate ahve to learn when he have to suport you and when he are free to nuke ppl down