He assumed Jack is staying with Tarasenko and went to cover the 3rd guy on the ice which is what tends to happen in 3on3 OT and then ... Jack pulled up. And they did this at pretty much the exact same time. Kane would not have skated towards the centre if he didn't think Jack is sticking with Tarasenko. When both found out that the other guy is not covering Tarasenko anymore it was too late... You can twist it any way you want, still won't change what happened. It's quite possible it was Kane's fault, but I can't blame him without some clarification from Housley on what is being asked of the players.
This is the exact moment Kane started skating towards centre ice to cover. You can see the shadow of Parayko and I can see exactly what Kane is thinking, "I should go cover the pass behind Jack because it seems Jack has Tarasenko covered". Unfortunately at the exact same moment Jack is thinking "Kaner has it covered so I go cover the pass behind me". Note that at the point kane decides to go for pass coverage, they are still in the STL zone and Jack has Tarasenko seemingly covered. Split second and a step the wrong way by both, Tarasenko cannot be stopped.
View media item 945
Could have Kane waited 1 more second to go cover Parayko - Yes.
Could have Jack stayed with his man for 1 more second and see that Kane is going to cover the pass - Yes.
Both probably prevent the goal, neither happened.
Only Housley can say what he has asked them to do on 3on3 and who covers you. You, DJ, Jame and anyone else here is guessing while at the same time bashing Kane cause that's the easy thing to do.