Okay. You need to consider the range he gets to the river with. A passive guy like this almost never has marginal hands here like Tx or even 7x that check back the river, but call a bet. His range on the river is basically straights and better, therefore, he has no hand that's weak enough that he checks behind and will almost certainly be stationy vs a c.r. Since his range is like this (as defined by his turn line) he'll be bet/calling pretty much all of it, but not raising a lead by you with all of it. Therefore, c/r for value has by far the highest EV since you're going to have like 70%+ equity vs his straights, worst boats etc etc and these hands all bet/call the river.