My DS was another who just doesn't have the personality for sleep training. And I certainly don't. We co-slept and muddled our way through the early years. Now at 2.5 he climbs into his own bed and says goodnight to us and sleeps for 10-12 hours a night (no day sleep since he turned 2).
He's extremely bright and struggles to switch off so I think that's why a) CC would never work for him and b) he doesn't fit the 12 in 24 mould. Occasionally he will do a 13-14 hour stint and usually it's followed by him doing something I had no idea he could do (like pointing out table numbers 49-58 the other day at a cafe. I didn't realise he recognised numbers past 30).