Prendre plus de value river?

Winamax - 10/20 NL - Holdem - 10 players
Hand converted by PokerTracker 4

BB: 75 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)
UTG: 75 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)
UTG+1: 75 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)
UTG+2: 75 BB (VPIP: 23.64, PFR: 20.75, 3Bet Preflop: 5.00, Hands: 55)
MP: 75 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)
MP+1: 73 BB (VPIP: 100.00, PFR: 100.00, 3Bet Preflop: -, Hands: 1)
MP+2: 75 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 1)
CO: 73 BB (VPIP: 10.53, PFR: 2.67, 3Bet Preflop: 7.14, Hands: 76)
Hero (BTN): 73 BB
SB: 81 BB (VPIP: 50.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 5:spade: 6:spade:

UTG calls 1 BB, fold, fold, fold, MP+1 calls 1 BB, fold, fold, Hero calls 1 BB, SB calls 0.5 BB, BB checks

Flop: (5 BB, 5 players) K:spade: 9:diamond: 3:spade:
SB checks, BB checks, UTG checks, MP+1 bets 5 BB, Hero calls 5 BB, fold, fold, UTG calls 5 BB

Turn: (20 BB, 3 players) 8:diamond:
UTG checks, MP+1 bets 10 BB, Hero calls 10 BB, UTG calls 10 BB

River: (50 BB, 3 players) J:spade:
UTG bets 14.9 BB, MP+1 calls 14.9 BB, Hero calls 14.9 BB

UTG shows A:diamond: K:club: (One Pair, Kings)
(Pre 40%, Flop 50%, Turn 67%)
MP+1 shows K:diamond: Q:club: (One Pair, Kings)
(Pre 20%, Flop 9%, Turn 5%)
Hero shows 5:spade: 6:spade: (Flush, King High)
(Pre 40%, Flop 42%, Turn 29%)
Hero wins 94.7 BB

Tout est dans le titre.
Franchement, j’étais persuadé qu’au moins un des deux (particulièrement UTG avec son donk river) avait une flush meilleure que la mienne. Ce qui explique mon call.