potty training

My youngest son is 22 months old, the other night he woke up in the middle of the night & took his diaper off, peed through his blankets & my SO found him naked, sitting on the couch. Today, he's taken off both of his poop diapers (didn't play in it just took it off & left it. I don't think he's ready to start potty training yet. All of my other kids were potty trained by 2.5, he's not even 2 yet & he doesn't understand the concept at all. Usually by 2 I start introducing the potty & by 2.5 they're fully potty trained (no pull ups or even diapers at night.) Would it be crazy of me to start trying now? Also I dont know of this is important or not, but he HATES clothes. We dress him constantly throughout the day but he's always taking his clothes off, just recently started taking the diaper off the past 2 days.