Alex, agree.
As I said above earlier, I find it hard to see the two remaining FFGs being maintained in commission (at least until the Hunter class start to commission), unless something happens in the next little while. But if they were kept in commission, it doesn't necessarily signal a permanent increase to 13 MFUs in long run as you've pointed out.
Whilst technically the RAN currently has 11 MFUs in commission (2 x FFG, 8 x FFH, 1 x DDG), from an operational point of view the situation is a little different, 2 x FFGs, 5 x FFH (3 x FFH on the hardstand in Henderson), and 1 DDG in commission for the last 12mths working up and getting closer to FOC.
In reality there are around 7 FFG/FFH operational + 1 DDG working up.
So yes, potentially there is an argument to keep the 2 remaining FFGs in commission for a bit longer until the FFH have completed their upgrades and the 3 DDGs are at FOC.
Will that happen? Probably not.