Hi Flannerz and welcome to the Emirates forum and congratulations on the upcoming wedding. Hopefully you'll stick around and join in the discussions and am sure you'll get spot on advice for all of your Emirates questions.
So, to your question. It is obviously important to you that as newlyweds you will want to sit together and as you must be on saver tickets, the only way of guaranteeing this unfortunately is if you pay for seat selection, however, there will be a lot of other passengers in the same boat as you and the majority, I would imagine, will most likely defer until OLCI opens at T-48 (to note that this should be for your onward connection at this time too). I would say that your chances at OLCI would be pretty good to get two seats together but, you are on fairly busy routes so if I was in your shoes and wanted definite confirmation that you were both sitting together, I would pay for seat selection thus removing one of the things that could spoil what should be a most memorable trip. Others may advise differently but the ultimate decision is yours and the risks that run with it.
Whatever you decide, I hope it all goes well, and please have a read through the forum.
Once again welcome and congratulations.
Safe & Happy Travels