Do you guys know if a couple flying together within the same booking, if they don't buy reserved seats will they still be able to fly together?
The real answer to your question is probably yes but is not certain. Ryanair will try to allocate seats together for people travelling in the same booking but cannot guarantee it.
I would imagine the sooner you check-in online the more likely you are to get seated together as seats are allocated at check-in.
Hope that helps.