"One redeemer was quite sufficient in the plan which God adopted, because only one had sinned, and only one had been condemned. Others shared his condemnation…One unforfeited life could redeem one forfeited life and no more. The one perfect man, “the man Christ Jesus,” who redeems the fallen Adam (and our losses through him) could not have been a ransom for all under any other circumstances than those of the plan which God chose." – The Divine Plan of the Ages (1886) p.132
"As many as have shared death on account of Adam’s sin will have life-privileges offered to them by our Lord Jesus, who died for them and sacrificially became Adam’s substitute before the broken law and thus gave himself a ransom for all." – The Divine Plan of the Ages (1886) p.156.
So according to Russell Adam is redeemed. This was changed by Rutherford in 1939.
"The judgement entered against Adam was just, it must stand forever... This text does not say or mean that Adam was or is ransomed, but does mean that the human perfection once possessed by the perfect man Adam (and which human perfection carried with it the right to life, which life and right thereto were forfeited by the wilful disobedience of Adam) is purchased or bought back or ransomed for Adam’s offspring, who were prevented from receiving that life and right thereto by reason of Adam’s sin" – Salvation (1939) p.176.