"Not your worst boy. But logical arguments don't justify implausible conclusions.

Do you really think that you, you of all people, are subject to our Lord's special attention? Really?"

He turned in his pacing to yell at Sergei gesture at the wall as he muttered to himself 

Counter-Interrogative: 

Do you really think you are that special? Really? 

Yes.

Yes.

He was special. The bare facts bore it out. Consider: 

1. Almost no orphans became clerics. Most were sold off for indentures too early, or were too weak to make the cut. Like a soldier who became a Count was far scarier than a mere Count’s son. That alone implied he was unusually talented. 
   
   
2. He hadn’t just been Chosen, he’d been Chosen near instantly on their first night. None of the long fast and prayer that some had needed. The others hadn’t seen it, but what clearer evidence of Asmodeus’s favor could there be?
   
   
3. He’d been picked out by Sergei for private lessons, for special treatment. His cunning attack on the noble children had demonstrated his talents, (if not judgement). After proper correction he’d been assigned to a far away city where the Seminary rarely sent people, where he’d had the opportunity to excel.
   (Had Sergei known something? Had he been nudged to put Orgull here and now where he could make a difference?) 
   
   
4. He’d defeated a higher circle cleric in single combat. That was supposed to be near impossible.
   He’d stabbed the Senior Presbyter from behind, the knife sliding into his neck with seemingly no resistance, the man had barely fought back, his dead face looked more surprised than anything, he hadn’t considered Orgull a threat, he’d trusted him.
    
5. He’d survived the siege and then escaped overwhelming odds after being treacherously ambushed. The Galtans had tried to chase and harry him, he’d tricked them, they’d thrown spells at him, he’d avoided them. He’d been alone in a crowd of traitors ready to turn him over to their new masters and he’d survived. The crowd had turned on him, but he’d survived. 

Conclusions:

He was either exceptionally talented, and therefore valuable, or Asmodeus had been intervening to help him, meaning he was unusually valuable.

Either way, he should act on the assumption that Asmodeus had put him in this specific place and time for a reason, and look for what that might be. Even if there was no specific plan for him, acting like there was would guide him to where he could serve best.