So the block has definitely been rebuilt in the past because as far as I know, Mahle does not make Toyota's pistons:
One of them shows scuffing on the skirt:
That cylinder bore doesn't *look* bad, in fact most still have pretty good cross hatching. But this other cylinder does not. I find it odd that the cross hatching is worn on the side of the cylinder rather than the normal wear from the crankshaft stroke:
The bearings all looked to be in like-new condition except the main bearings on #1:
Crank walk maybe? Bent crankshaft? I'll double check tomorrow, but I think the abnormally worn cylinder crosshatching is also cylinder #1...