OT Coin Toss = 49'ers Demise?

Noble Saint said

A 6th quarter. My question is if the chiefs take the lead in the 6th quarter, does that mean the game is over or do they play out the quarter? Also, after both teams possess the ball does it become sudden death where next score wins? Doesn’t seem explained very well in the rules.

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The way I understand the rules, if Chiefs would have taken their initial possession of OT into 6th quarter and scored a TD the game is over, pretty much like it did in 5th quarter. The only way the 6th quarter would continue is if the Chiefs ended up kicking a FG and tying the game. Then whichever team makes the next score wins.