If Louise Valierre summoned Vegeta instead of Saito, it could potentially cause some major problems! Vegeta is a powerful warrior who is used to getting his way and may not take kindly to Louise's orders. Vegeta is also renowned for his arrogant attitude and can be difficult to control. On the other hand, Vegeta could prove to be a powerful ally if Louise is able to gain his trust and convince him to help her. In the end, it's up to Louise to decide whether she wants to summon Vegeta or Saito.