No one can replace the reserves( the Poles do not call them reserves just 6 and 7 and 14 and 15).one reserve can replace the other reserve but only if team is 6 down.
Edit the no 8 could replace the 6 and 7 and 14 and 15 providing he is Polish U 21
Think it`s a mistake that you think it`s a mistake No R/R for Gorzow, whereas Rybnik probably have it for Lebedevs, therefore Woryna probably 7 rides against Bartosz`s 5