Car crash?! Hope everything's ok, sounds pretty stressful, hun.
I have to agree with Sarah and say loud and clear that something is only a problem if it's a problem for you and your family. Don't do anything because someone said "you should" and I include BWers in that! So, if him not sleeping in the cot isn't a problem, then don't worry about it. Sleeping in a stationery pram sounds pretty good to me!
But if you'd rather have him in the cot, then let's try and help.
I had to do a super-long wind down and stay with my LO1 to get him really asleep every time when we started sleep training. So, all the usual wind down stuff, close blinds, sit, sh-pat. Sh-pat in my arms til calm and drowsy, then into the cot, still sh-patting, settle in cot, keep sh and pat but start winding both down. Til they'd stopped but leave a hand laying on him. Stay the full 20 minutes or however long til the jolts came. Watch him settle back and drift into deeper sleep. Creep out of room. Sigh. Put on kettle.
Yes, I really did have to do this to teach him to sleep. And it looks like I was ruining his ability to sleep independently but putting him down awake with no intervention was a non-starter. He was a touchy baby with a streak of spirit who needed every bit of help available. Now, when we had established this, I started working on Gradual Withdrawal of sh-pat, and the day came where he basically told me he didn't need me any more. So he had learned. He is still a super sleeper.
You may have done all of this already, but if not, it is worth trying this 'super wind-down' and see if it helps at all.