I suspect that the absolute bare necessity is the tank and healer should be full access. As for DPS, I theorize I could get away with F2P toons, and the fights would simply take longer. Though, I could be completely wrong, and having any F2P toon in my party might be detrimental. I haven't max leveled any of my toons, yet, so I do not know if there will be a hard ceiling to what I can and cannot do in the later expansions. (Is in TBM content, now).
What are your takes on this?
What are your takes on this?