OK, people...please help me!

Now addicted to Mile High on BBCA, I am confused when I caught the last eps. What has happened to the cast? I understood that characters left and were only there for one season, but could someone explain:
1. Understood Emma got fired for her altercation w/ Janis; Janis was fired I thought too and was heading out of Fresh, but...
2. Was there a word on what happened to K.C.?
3. Was there a word on what happened to Jason?
4. Where's John?
5. Was there an "entrance storyline" for Jack and his sister Poppy,
because I didn't see her until she rescued a drowning Marco?

Understood that characters come/go, but I hate it when things happen without any explanation.
**Also good to see that a new season of Footballer's Wives comes back in February on BBCA**