I think Verdonschot has improved massively over the course of the season, but she would still need another big jump to get to Alvarados level, which would really get the spidey sesnse tingling. In my view Brand and Alvarado at their best are pretty evenly matched, so I disregard Alvarados Worlds performance, clearly not at her best.Yes, Alvarado is still better than Verdonschot as well, but beating her is probably a more realistic goal than beating Fem or Puck.
I don't know if a bigger road season will hurt Fem's form in cross though, if you look at Van der Poel it's not exactly made him any worse. She'll probably only get better. As for the form of the other two, with Van Anrooij you can't really tell, before she really got going she was out already. Pieterse during the Christmas period seemed like the Pieterse of last year.
For me, at their best it's Fem-->Pieterse, Van Anrooij-->Brand, Alvarado, maybe Vas-->Backstedt, Casasola, Verdonshot, Van der Heijden etc. Not including Persico, Vos who did no cross this winter, Betsema who was completely out of sorts and to a lesser extent Worst.