If you've got the injectors off, have somoene watch the injector holes while you try to crank. Since it won't turn by hand even without the compression (theoretically), it sounds like it's hydrolocked, unless there's reason to suspect physical internal damage (in which case I would imagine that it wouldn't be able to move at all, in either direction).
I tried to bar over a GM 6.2l diesel by hand once, and it took a lot of force (I guess the water trying to get into the precombustion chamber), then a whole bunch of water spewed out of the glow plug hole for one cylinder. It still didn't bar over great after that, but I was able to bar it enough to get to the last bolt on the injector pump...got it apart, and...well, the engine had sat like that for a year and had the rust to prove it.
