Not necessarily, rings are generally going by 3: the top one is the "fire breaker", the mid-one is the sealing ring and the bottom is the "oil sweeper"
A worn "sealer" might still keep the (relatively low pressure) compression in the cylinder and leak under the high-pressure combustion stroke, letting some gases reaching the low pressure side of the engine.
A broken "oil sweeper" might still be in place, even in two or three pieces and do its job together with a nice ticking.
Anyway, at this stage, all can only be conjecture and the best solution would be to open for autopsy ...
BRs, Bernie
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