I might think that they (disqualified offerings that have been redeemed) are subject to the priestly gifts (shoulder, cheeks, and maw); it is, therefore, written "as the deer," (which is not subject to priestly gifts).
I would then exclude them from the priestly gifts, but not from breast and thigh. It is, therefore, written "and as the hart" (for additional exclusion).
(But then I would say:) Just as deer and hart are entirely permitted (including their fats), these, too, should be entirely permitted! It is, therefore, written "Only the blood" (i.e., the fats are forbidden as is the blood).