Also, hilariously, his is both the best and worst feedback. Extensive praise for the writing, loves the half that takes place on an active crew, and... also finds himself wanting to be in that half all the time. High praise for the insights in the other half, where my Thucydides character is narrating, but still likes being in the active sections far more.
Which... raises a difficult challenge. We'll see what he thinks of the 2nd half when it's ready for him, but for now I have to trust my gut!