I really would rather have Tsoulos and Vella NOT play if they are not fit. Why risk further injury?
Shoulder and chest injuries are horrendous - painful, and can often be career-threatening. Just ask Ryles a year ago whether he thought in all honesty he'd be back playing Origin.
Vella when he's fit and prime for a good night is great - just ask the Panthers a few weeks ago. He was awesome. And against Manly.
I think if we are to keep Vella (which I think we should; he's a Parra boy, it would be a shame to see him go), he needs to be an impact prop coming off the bench from now on. Maybe a quick, strong, mobile prop like himself would work better against tired opposition.