Just bumping this recommendation for other struggling readers and giving an update.

DS6 continues to make progress and is really learning to decode longer words.

Tonight he showed his Toe by Toe book to his grandmother. He explained how the book works, where he started, where he is working currently and what he'll be able to read when he is done. He seems to have really taken ownership of this process.

He actually said reading was one of his favorite subjects at school.