Sooooo I can only answer some of these due to obvious spoilers of the future seasons.
1. Yes and yes.
2. She's a romanceable character period. Her absence in S2 is the only reason there's hardly any content but there are checks.
3. He was beginning to recover without Sydero. What happens with her back, can't say.
I won't answer the less important ones as of course those are spoiler lol. But all will be answered or at least explored lol.