I couldn've really cared less about Savos. Kodlak on the other hand I felt a stronger bond
It makes sense to me; no one forms a close bond with everyone they meet throughout their life, so it's sensible really that you don't wholeheartedly mourn every NPC that dies.
I could care less for any guild leader that died... other then Kodlak. He and my characters always bond.
Yes.
Didn't feel a single thing for any of the faction leaders aside from Astrid and Brynjolf; a mix of pity and disgust for both of them.
Not to mention I barely had any kind of conversations with Savos. As a thief I'm only in the TG for myself so I don't care about anyone but me. As far as Astrid goes,
It's difficult to feel a bond with poorly written characters a part of a rushed questline with zero use of proper pacing.
But you don't spend a significant amount of time with any of the guild leaders; they're like the headmaster of a school, you know they're actually in charge ... but in reality they have little contact with you and it's their representatives that you see more often.