Please read the interview Yoshi P directly says this is already decided on just not implemented:

"I think it’s OK to call whenever you like. When you can’t kill the boss in a free company using it as a final card asking “Ifrit beat the crap out of it” or in PvP area taking those heavy (hardcore) players always beating everyone up “Please take them down with one shot”.
It’s OK to go overboard."

Please read the entire post before responding.

Also just another point, I would be fine if these Free Companies got his as a small buff like having him fight with you doing a basic increase of damage but not an "I Win Button"

Also Alerith how long did it take for them to nerf soul eater, this needs to stopped before it comes out.