Kierkegaard would likely argue that Meursault is not in control of his life, but rather that he is deluded into thinking that he is. Kierkegaard would likely view Meursault's belief in his own control and confidence as a form of passivity, as it is a refusal to engage with the existential questions and concerns that are inherent in human existence. Being in control and being content would look, sound, and feel like a deep sense of peace and fulfillment, rather than the superficial confidence that Meursault displays.
The ending of the novella could be seen as both satisfactory and predictable. It is satisfying because it provides a sense of closure and resolution to Meursault's story, but it is predictable because the events leading up to it have been building towards this conclusion. The last two pages provide new insight into Meursault's character and his relationships with others, showing that he has come to understand the futility of his previous beliefs and attitudes. Meursault desires most to be free from the constraints and expectations of society, and to be able to live his life on his own terms.
Meursault has been confronted with the abyss of the indifferent universe in many ways throughout the novella. For example, he is confronted with the meaningless of human existence when he attends his mother's funeral and realizes that her death is insignificant in the grand scheme of things. He also confronts the abyss when he is on trial and realizes that the justice system is arbitrary and unfair. In response to these confrontations, Meursault initially acts with defiance and defiance, but ultimately comes to accept the absurdity of the universe. Meursault himself acts as an abyss to others in his lack of empathy and emotional engagement with the world around him. Others respond to him with confusion, anger, and fear.
One anticipated counterargument to my argument in question 1 could be that Meursault is not deluded about his control over his life, but rather that he has a different perspective on what it means to be in control. Some might argue that Meursault's confidence and self-sufficiency are not signs of passivity, but rather a form of active engagement with the world. They could also argue that Meursault's understanding of contentment is different from Kierkegaard's, and that his sense of peace and fulfillment comes from his rejection of traditional religious and moral beliefs.