There are two questions to be distinguished here. (1) Does adding 1 year to the life of a wealthy person in the USA increase their well-being more than adding 1 year to the life of a poor person in Kenya would increase their well-being? (2) Does adding 1 year to the life of a wealthy person in the USA increase overall moral value more than adding 1 year to the life of a poor person in Kenya would? Your reply seems to be addressed to question (1), but the original discussion and my comment concern question (2). If the distribution of welfare makes a difference to overall moral value, then the answer to (2) might be ‘no’ even if the answer to (1) is ‘yes’.
There are two questions to be distinguished here. (1) Does adding 1 year to the life of a wealthy person in the USA increase their well-being more than adding 1 year to the life of a poor person in Kenya would increase their well-being? (2) Does adding 1 year to the life of a wealthy person in the USA increase overall moral value more than adding 1 year to the life of a poor person in Kenya would? Your reply seems to be addressed to question (1), but the original discussion and my comment concern question (2). If the distribution of welfare makes a difference to overall moral value, then the answer to (2) might be ‘no’ even if the answer to (1) is ‘yes’.