Later Etruscan League

In the Later Etruscan League list the listing for the Hoplites with Long Spear is
8-18 Hoplites FP 4 1 C 1 Long Spear 12/9

Right below it is the option of upgrade the Hoplites to VBU 5.
up 6 Hoplites FP 5 2 B 3 Long Spear 23

The way the list is constructed it looks like the intent is to not allow the VBU5 Hoplites to form large units (there doesn't seem to be back rank partner because the two unit types have different discipline ratings.) Is that how others see it?

Gaius there is precedence in army lists for large units to have different discipline ratings. In the Spartan list it allows the Perioikoi B class to be the rear rank of Spartan A class. I put a query under rules as to how exactly that would work assume it would always fight as A class as B class second rank removed first also assumed its DT would be B class even if that rank had been removed. No reply yet on this one.
On the later Etruscan list it mentions for large units it says they have to be of the same type, the earlier Etruscan list makes a point in saying that they didn't fight in deep formations so cannot form large units. Maybe these upgraded units on the later list are a throw back to the earlier way of fighting.
I would deploy them as single unit but it could be that the note needs amendment so can be part of large unit with different class. Think as worded should be single unit. eric