[intheflatfield]

[ QUOTE ]
I read him as

Flop: "I bet my draws small and my made hands big. I'm on a draw, and since the flop is rainbow, I'm on an OESD."

Turn: "I made my straight, betting bigger now."

River: "I'm surprised you're still here, but since you are I'll just value bet this puppy."

[/ QUOTE ]

This is my take as well FWIW. It's still a tough situation, but I don't think he has trips. IMO, had that been the case he would have been more likely to check the turn, trying to induce a bluff.