My LO usually wakes around 6-6:30am too but is usually happy to play in the cot for a while so it doesn't feel so early :-) If your LO isn't happy to play in the cot on waking I think the advice is to give them time to play in the cot during the day, with you in the room if need be to start with and then hopefully when you're not in the room, so they associate the cot as somewhere safe where they can be on their own happily.
I've only heard of the am nap being associated with EW if it's too early in the day, but I don't think 9:30am or 10 would be considered to early at this age. There is a school of thought that an earlier BT (eg 30min earlier) can actually help LO to sleep in longer in the morning... may be worth trying... I think if your LO is putting himself back to sleep when he wakes at 4:30am that is fabulous and I would try not to worry about it! I would also just try to make sure there's nothing waking him at that time that you can prevent eg noises, light, being cold.