What range do you isolate here?

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What range do you isolate here?

Blinds: $0.01/$0.02 (8 Players) BN: $2.44 (Hero)
SB: $1.96
BB: $2.12
UTG: $2.00
UTG+1: $2.57
MP: $2.08
MP+1: $2.00
CO: $3.36
Preflop ($0.03) Hero is BN with A 6
4 folds, CO calls $0.02, Hero raises to $0.08, 2 folds, CO calls $0.06
Flop ($0.19) K A 5
CO checks, Hero bets $0.14, CO calls $0.14
Turn ($0.47) K A 5 4
CO bets $0.22, Hero calls $0.22
River ($0.91) K A 5 4 A
CO bets $0.44, Hero calls $0.44

At 184 hands CO is 32/0 and limp% is 33 and has folded to a cbet 13/18 times or 72% while only 3/17 times to an isolation. So no preflop fold equity but enough fold equity postlfop. A fit and fold fish. We also have a player at the sb who at 91 hands is 26/2 and who has open limped BTN and CO which shows us that he's very passive(likely to play fit and fold on the flop)as Grinder's Manual Author said in a video.The BB is 16/12 at 1100 hands with only 35% fold to cbet and 3bet of 4.2%. Also fold to steal is 77%(very good).

The BB playing too tight vs steals decreases the chance of multiway pots and the SB playing a bit looser than he should increases it a little. If we sum up those 2 effects it's like it is a defeault scenario(like playing vs 2 average regs) regarding fold equity we have vs the Blinds preflop. Now in this spot multiway pots will happen more frequently vs the scenario where CO folded and hero open raised here, so we might want to tighten our range a little.

Getting heads up with the CO or the SB would be very good because those players fold too much vs a flop cbet. But we'll get some multiway pots sometimes which we do not want with A6o since our fold equity on the flop decreases a lot(if SB was flatting here to our iso a 70% range then things would be not good for A6o. We would need to tighten our range)

So, if we iso with A6o, this means that we iso with A7+ and also with A6s. Would you iso with A2o here? I think it would be ok to do that(with all Aces). I think that if our defeault open range in BTN is about 50% then in this spot, it should be close to that. Maybe 40% iso range.

So, based on the iso triangle the reason we may iso here is mainly for flop fold equity(position helps a little bit also). My main question here is should we tighten our range and if yes then how much?

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