Great news that your son was cleared for LDAC.
As far as scoring, this is anyone's guess. I have a feeling there are going to be a lot of meetings and briefings about LDAC when the dust settles.
There have been numerous rumors on this board and others regarding what is happening and how the scoring will happen.
Some have said that everyone will get a S, others from 1st and 2nd Reg. have said they received an E, so nobody knows for sure what is going to happen when it comes to the overall score.
It seems it would be difficult to give the same E for the later regiments considering they are only doing a fraction of what the earlier regiments have done. My son is in the 7th, I have seen pictures of them doing the APFT but now hear it was cancelled for all following regiments. Land Nav has changed drastically. The biggest issue is the patrolling lanes, they have been cut way back and some are led by the cadre, this makes it hard for anyone to be in a leadership role and give little to be evaluated on compared to the earlier classes.
In short, LDAC seems to be a mess which will most likely take time to sort out when it's all over.
My guess is that it will take longer to complete the branching process this year due to all the LDAC issues, cadets will test their patience this year while they wait.
Even when it's all said and cone, nobody will really know how they made their decisions. When my older son went through this it was a very transparent process, they knew their OMS score, where they were on the National and Active Duty OML, they knew their exact number. The process is nowhere near transparent anymore, Cadet Command does not release either the National or Active Duty OML, cadets have no idea where they are on the list. Now cadets have to wait until the branches are released before they even know if they've made Active Duty, and that's all the info they get, they will never know where they were on the list. Not a good process in my mind when it has so much effect on the cadets future, their future is in the hands of those hidden behind the curtain.
Best of luck to your son, I guess we'll know more as more cadets finish LDAC.