You're probably right. Its cr*p though. The best 16 riders should be in it, irrespective of nationality.
Heres the top 16 in world rankings based on all leagues
1 Jason Crump 8.24 2 Nicki Pedersen 7.80 3 Emil Sayfutdinov 4 Tomasz Gollob 7.34 5 Greg Hancock 6 Jarosław Hampel 7.25 7 Leigh Adams
8 Fredrik Lindgren 7.13 9 Rune Holta 6.85 10 Andreas Jonsson 6.81 11 Wiesław Jaguś 12 Piotr Protasiewicz 6.67 13 Adrian Medziński 6.51
14 Ryan Sullivan 6.50 15 Chris Holder 6.45 16 Lee Richardson 6.37.
Antonio Lindback is ranked as 27 in the world add to that fact that he didnt even qualify for the grand prix challenge then he clearly does not warrant a wild card pick.