Big mutie humans aren't that big or powerful, and cost no more than many "standard" xenos, so I don't think they need to be that limited. Ogryn and sllyth are contenders (though in some cases are not that bad, I think -- An ogryn with an axe and a ripper gun and flak or mesh armor isn't that big of a deal, about on par with a well-equipped heavy). A big mutie ogryn or sslyth on the other hand should definitely be relegated to the "big guy" slot.
It's not perfect, because it has a lot to do with equipment, but I tend to think of it in terms of TG ranges: Anything up to about 250-300 TG is probably okay in a heavy or elite slot. Over 300 TG and I think it becomes a candidate for the "Big Guy" slot.
It's not perfect, because it has a lot to do with equipment, but I tend to think of it in terms of TG ranges: Anything up to about 250-300 TG is probably okay in a heavy or elite slot. Over 300 TG and I think it becomes a candidate for the "Big Guy" slot.