This is from 100PLO deep, ante. V is almost unknown and has been playing very loose.  So far, his stat is 67/31/14.3 (42 hands) AF1.3. He doesn't look considering position too much. Frankly say, I think he is just a stranger here. 

I think my playing was very weak and I could have drawn value more. I had Ah, and if he is not drawing Wrap or OESD, or just calling down with 23**, 37** and so on (rare....), I had no idea what he is drawing. On turn, I thought I could bet like half of pot, however, it may have made him fold. I'm not sure if this 1/3 pot size was correct. He kept calling down to river and there came one more 7, and board was paired. What was the best line for the highest value? thanks for your advice.