Basically, prior to when they attempt to throw you, there is no GA (unless there was a previously blocked transition). So you block the throw, therefore you get GA (lets say 50%). Now when you throw them, you have a faster throw because of the 50% GA gained previously. If they block that throw, they then get the GA you previously had, so it's just as fast as the one you attempted.
In other words, the throw YOU do (after block) is the same speed as the second throw they do (the one that works). You just have to be as fast as they were. It's pretty quick, you can either react to it (if you are fast) or 100% flick it.
Keep in mind stamina and grappling stats also variables. If you have let's say Nate Diaz (terrible clinch stats) vs a Khabib, and you swap throw / denies, his second throw will be faster than your previous one because of the absurd stat disparity. None of them are "unblockable" although it may seem that way. *It's about recognizing the variables at play and then deciding what kind of deny you need to do in order to block it. (*Read more -->
http://www.operationsports.com/forum...-roster-2.html)
And yes, the clinch is very turn based unfortunately.
As far as take downs, use head sways. Sway back and then shoot when you slip a jab. The more strikes you make someone wiff prior to shooting = the more GA you get = faster take downs.
None of those are stupid questions man. Honestly the stuff I wanted to avoid was like "how do you deny guard" ect. Yours were perfectly valid, hope my answer makes sense