So far we agree. What's the problem?

: ...And why do you say that the Balrog was not hunched?...

Because Tolkien doesn't say or imply that it was hunched. Why should we assume it was, except for the convenience of arguing it didn't increase in height?

: ...It was an immense creature, travelling swiftly through
: hallways tunnelled by *dwarves*. It very well may have had to
: stoop when it moved from chamber to chamber.

These would be the same "hallways" that Tolkien called roads, and it would be in the same immense cavern that Tolkien said "was loftier and far longer than the one in which they had slept"? The first hallway had "a vast roof far above their heads upheld by many mighty pillars of hewn stone."

How gigantic should we assume without any textual basis that this Balrog was, when it obviously crawled or somehow squeezed only part of itself into the tiny Chamber of Mazarbul to counter Gandalf's spell?

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