Nap Still Required???

We've been going back and forth with Caden on his naps. I normally put him down 5-6 days out of the week. He still needs it, but we are getting close to giving it up based on his bedtime antics. The days that I let him stay awake, I usually find him sacked out somewhere half way through the afternoon.

Notice his thumb is NOT in his mouth, but it's in close proximity encase he needs it.