Asgreen, Ballerini, Lampaert... have all been sick and haven't been 100% since. Declerq has been out with a heart condition and he is a vital part of the team, basically doing a three man job until the finale starts. Alaphilippe isn't doing cobbles this year and Stybar is getting old. Jumbo has bought two guys to support Van Aert who both would be classics leader at any other team.
Like i said in other threads, considering they had Evenepoel focus on short efforts, which basically makes it useless to send him to TA or Itzulia for GC, i feel they could have sent him to some of these classics instead. He's shown at BBT, the WCC and some other races that he copes well with these climbs, the distance and cobbles.