It's not a case of premiership players moving to us, it's more about their moves then making championship players avaliable that could do a job for us. It's the trickle down effect that is caused by the 25man rule, or a few big money signings by other clubs (other than man city)
I'm pretty sure tyson would have signed if Forest had managed to get Wittingham and Pratley, as he would have then been deemed surplus. - but he's ended up playing in their opening 2 games.