Your DS sounds like mine was 10 years ago - speech delay, echolalia etc. At around 4.5 something quite amazing happened and it was like his whole brain rewired itself, at first I thought it was due to play therapy he started but realised it was neurological. It was like suddenly all these concepts he didn't get before suddenly clicked into place, it was like a daily miracle and quite emotional. After about 6 months he settled but by age 5.5 we had a very different version of autism than the one we thought. When he started mainstream school at almost 6 (a year late) the autism was almost invisible. His behaviours increasingly became more like ADHD which he was diagnosed with at 10.
He is 15 now and doing really well at secondary school. The transition was hard as organising books etc is very tricky with ADHD but he managed. The school grading system has worked well for him, he was lazy about homework in primary school but it motivated by numbers so works hard now to achieve a % he wants. He is academic so is generally an A student. He is an amazing athlete and plays 2 sports at club level and one at county level so our weekends are spent driving around the place for matches. He is also on 2 school teams, so thats 5 teams in total!! He is very buff as he needs high impact exercise for sensory regulation and this obviously helps with his sports. He goes to the gym any day he does not have training, sometimes both in a day. its a bit obsessive but he needs to do it. He is a very outgoing confident boy and is also very good looking. I feel like we live a bit of a double life because on the face of it i'm describing a golden boy who sails through life....
BUT - home life is very difficult. Anyone living with ADHD will say how headwrecking it is, leaving things lying around, forgetting to close doors and drawers etc. These are all minor. The bigger issue is his attitude. Since about 9 his behaviour has been described as oppositional, he likes to argue and ridicule anyone who disagrees, he demands things and comes across as entitled and bratty, sometimes verbally abusive. His mood dictates everything, I see we possibly helped create this monster by giving too much leeway but we had to choose our battles so carefully every day. Covid lockdowns were a nightmare for him and in some ways the negative patterns were really laid down here. At school he is more pleasant and he is always laughing and messing with friends so there is a huge element of masking, and a release when he comes home which involves being nasty to his family. Its very hard to know what is ADHD, ASD, hormones or just being spoilt. He has a good heart in there somewhere and hates injustice of any kind and loves his dog.
He is hugely popular on the face of it but cant hold friendships. He develops a group of friends then after a few months gets pushed away. He had settled well in secondary with a nice group but they dumped him and one kid was kind enough to explain why, and it was all the same behaviours we see - interrupting constantly, arguing pointlessly, dominating everything and just being annoying. This was a wake up call and the first time he really acknowledged he has an issue. Intervention is almost impossible as he will not cooperate, last psychological assessment was a disaster as he said she was a nosy bitch, and he refuses to take ADHD meds as he is "not a f*ing retard" - you get the picture .
The good thing about a lack of social cues is DH is very forward and finds new friends quickly, being talented at sports and good looking helps as he comes across as the "cool kid". He will for example go to a teenage disco alone cos he knows he will know lots of people there. He has recently latched onto a new group and they are great so I'm praying things work out for him now.
Sorry OP that was a bit long but I might as well be honest. Sometimes i feel we have a lot on our plate but it depends which "hat" i'm wearing. As the parent of a child with SEN i'm really really lucky but compared with NT children life is a struggle. I find it hard to talk to anyone because most parents of kids with SEN would think I have it easy by comparison but everyone else tells me he is just spoilt. Overall though he will live independently, almost definitely go to university and have a profession (he already talks about this) and hopefully work on himself so he can have relationships so he will be ok.