Your questions are very specific. If you read the threads about Port Lympne and Howletts, you`ll see that there are NOT a lot of locals/regular visitors of those zoos who post here (that`s very different for Chester zoo!). And to answer all your questions, you need not just a regular visitor, but one who knows the individual gorillas very well. Such a person may not post here at all or not regularly. So no, those are not easy questions.
By the way, you come along as a bit rude and very demanding. Why should someone from zoochat take a lot of time to answer your many questions, when you could easily find the answers yourself? Because you can`t bother composing a message to the zoo or doing some research by yourself? Sorry, that`s not a very good reason. Gorilla and elephant births and transfers for example are usually announced by the zoos and discussed here, so you can answer a lot of your questions yourself by reading the older posts and checking the zoos homepage/facebook.