This is all hypothetical, but would it be in the rules? Rushen ups his average to above 5 (not likely to happen), gets dropped for Riss (on his Champ converted ave), then after missing 1 match, gets brought back as the RS in place of Scott?
Basically what Edinburgh did in 2009, when they dropped Wolbert for Tully (Wolbert must've been an injury replacement), then Dilger for Wolbert (something along those lines, my memory is fading a little on that situation).