TPGK 3 way [400$ 6H]

[Electrolux]

I open in the CO with 560 to start with.
Button calls with 450
SB comes along to, starting with 387.

Button is a donkey playing 60/20, and an AF of 0,7. A calling station, but only ovver 75 hands.
SB is a TAG playing 18/14

Flop (49)
Checked to me. I bet 42, Both call.

Turn (175)
Checked to me. I bet 115.
Is this a mistake since JT just got there?
What other lines to take?

Anyways, they both call. (would JT just call given the FD out there?)

River (520)
Checked to me. I have 387 left. Button 273, and SB 215.
What to do?

I checked. Button bet 200, SB folded, action back to me.
Hero? Easy call given the odds?

Input appreciated. Especially on the turn, I assume river is a call since I only have to beat a missed FD 200/720 times, i.e, less than a third.

[Semillon]

[Triple B]

[Zmej]

[T-Rod]

[Electrolux]

[Triple B]

[Electrolux]

OK, betting the turn was maybe a bit too strong.

Result, anyways: As said the SB folded, and probably was on a missed FD.
I called. Button had for a gut shot, and a turned pair. If he bet river for value or as a bluff is still not know to me.

[Triple B]

[Devbert]