Benoot could win more as a domestique for Van Aert than as a leader at any other team. He will have a bigger shot at being able to win from a late attack, with nobody wanting to drag Van Aert to the line, than he would have in case he was riding for himself as a leader at any team. He is borderline incapable of winning most races, because he isn't good enough to drop others and he can't sprint for sht. Moving to JV makes most sense, because he can't only help Van Aert in classics, he can also help Roglic in classics and GC. Benoot is a very capable climber, which is why i have been saying he should have been going after GC's more the past few years (considering he can't win classics or stages). But since he also sucks at TT him being a superdomestique for Van Aert and Roglic makes sense for all parties involved. For the team, for the teamleaders, as well as for him. He can come closer to winning something from that role and financially he won't do worse i imagine.
Could it be that Benoot moves to JV if Dumoulin moves to Bike Exchange ?