Guyer

Hello, I'm new here but not to guyver. I have just recently been trying to catch up with the guyver manga but i don't really know where i stand right now. The farthest i got was when Testuro and Mizuki were saved on the island of silha by that one zoanoid. I read some of the manga from online sites and some from here. Does the manga go on to explain how sho and aptom merge or how they figured this out? Was there anything in the manga that explained the fight between guyver 1 and guyver 3? and what's happened to guyver II F. I'm sorry if there are other posts like this one but i'm just a little confused right now. if anyone could just fill me in, that'd be great