If he has a lot of Ax, he certainly has a low of KQ/KJ/QJ/diamonds/low pairs.

Not all Ax will necessarily be calling down two barrels, while most of the above hands will.

Not all Ax will call a river barrel, but most of the above hands might choose to bluff facing a river check.

OP - do some hand combo estimates on how many possible combos will call a river bet, and how many won't call and how many might bluff etc. That should make the river line pretty clear.