I personally analyze 初志一貫 as simply being consistent (一貫) from the beginning (初志), not necessarily retaining the original subject (only implied). I believe this

I personally analyze 初志一貫 as simply being consistent (一貫) from the beginning (初志), not necessarily retaining the original subject (only implied). I believe this is the most frequent Korean interpretation because 初志 초지 is not a common Korean word (its synonym 初心 초심 is common) and 初志一貫 is probably the only phrase you can find this word.