From the court testimony:
"Mr. Holbrook’s testimony contradicts Petitioner’s argument that a “rank can include one memory device because, as Mr. Holbrook testified, a “rank is defined as a group that comprises a full 64-bit data bus,” and there were no 64-bit memory devices at the time and still today. EX2062, ¶ 247. Thus, in order to provide data across the full 64-bit data bus, more than one memory device is necessarily required to form a “rank.”
Holbrook's testimony defined "a rank as a group that comprises a full 64 Bit data bus". At the time of that testimony and even today, there are no single units that can supply data to a 64-bit data bus.
So as I read it, Netlists contention is that there CANNOT BE a single unit supplying all 64-bits. There HAS to be more than one unit to get to the 64-bit level.